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REVIEW 2 major objections 6 minor 41 references

Creative Problem-Solving: A Study with Blind and Low Vision Software Professionals

T0 review · 2 major / 6 minor · reviewed 2026-08-09 · deepseek-v4-flash

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Pith's one-line read For blind and low-vision software professionals, creative problem-solving is a daily necessity for accessing standard development tools, not an optional route to optimization.

desk verdict Honest, useful qualitative re-analysis with one overreach in the abstract: the sighted-comparison claim needs softening. read the letter →

arxiv 2501.19380 v1 pith:H3SDK5MV submitted 2025-01-31 cs.SE

Karina Kohl , Yoonha Cha , Victoria Jackson , Stacy Branham , André van der Hoek , Rafael Prikladnicki This is my paper · ORCID
classification cs.SE
keywords creativeproblem-solvingblindandlowvisionaccessibilitysoftwareengineeringworkflowadaptationassistivetechnologyqualitativeinterviewsopen-source
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

This paper argues that for blind and low-vision software professionals, creative problem-solving is not an optional improvement but a daily necessity: they must invent, customize, or repurpose tools simply to access standard development environments and complete routine work. Drawing on re-analysis of semi-structured interviews with 30 professionals, it identifies six recurring strategies, from building custom screen-reader add-ons to devising workflow tricks. The paper frames this as a contrast with sighted peers, for whom creativity is typically a path to optimization. The finding matters because it recasts accessibility adaptations as core creative labor rather than peripheral workarounds.

What carries the argument

The machinery is a thematic-analysis framework built on a componential model of creativity, which splits creativity into domain-relevant skills, creativity-relevant processes, and task motivation. The paper uses these categories to organize interview accounts into six themes and to interpret tool-building, customization, and workflow tricks as instances of creativity. This model carries the argument by making it possible to show that the motivating force behind BLVSPs' creative work is necessity and autonomy, rather than the optimization that the paper attributes to sighted professionals.

What would settle it

A matched-sample study using the same interview protocol with sighted software professionals would settle the claim: if sighted developers report routinely creating or adapting tools to access standard features or complete routine tasks, rather than mainly to optimize, the essential-versus-optional distinction would fail.

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Extended reading notes

Core claim

The paper's central claim is that for blind and low-vision software professionals, creative problem-solving is essential for navigating inaccessible work environments, in contrast to sighted peers, who pursue optimization. Through thematic analysis of interviews, the authors identify six themes: motivation driven by need, creation of opportunities, creation of tools, use and customization of tools, workflow strategies, and communities, sharing, and publicizing. These themes describe how BLVSPs build and adapt tools, such as NVDA plugins and autocomplete accessibility fixes, and develop strategic workflows to maintain autonomy and professional presence. The authors conclude that creativity is a fundamental requirement for basic job functioning for BLVSPs, not an optional enhancement.

Load-bearing premise

The study's central contrast with sighted peers assumes that sighted developers' creative problem-solving is mainly about optimization, yet no data from sighted developers were collected and no empirical baseline is cited to establish that; if sighted developers also create out of necessity, the contrast weakens even though the descriptive themes about BLVSPs remain.

Editorial extensions

If this is right

  • Organizations should give blind and low-vision software professionals dedicated time and resources to adapt tools and workflows, since creative problem-solving is a key part of their work.
  • Tool vendors should treat customizability and user-created solutions as first-class requirements, because real-world accessibility depends on end-user modification.
  • Open-source accessibility projects are not optional extras; they are the distribution channel through which BLVSPs get usable tools, such as screen-reader add-ons.
  • Teams should create channels for sharing accessibility solutions and feedback, and foster collaboration between BLVSPs and sighted colleagues.
  • Necessity-driven creativity can be self-reinforcing: solutions that restore independence motivate further creative problem-solving, so supporting early adaptations may compound benefits.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • An implication the paper leaves implicit is that its central contrast with sighted peers is an extrapolation; the interview data came only from BLVSPs, so a study of sighted developers is needed to verify that their creative problem-solving is primarily optimization-oriented.
  • The 'mandatory creativity' finding may generalize beyond blindness to other disability contexts and to any worker whose primary tools are not designed for them; the paper's framing of autonomy and professional presence could be tested there.
  • A testable extension is to measure the adoption and reuse of user-created accessibility tools (for example, screen-reader plugins) to quantify how the community-sharing theme translates into actual collective problem-solving.
  • If tool accessibility improves, the necessity-driven creativity documented here may diminish or shift shape, so the paper's claims are time-sensitive; a longitudinal replication would clarify whether the creativity is a stable trait of the population or a response to current tooling.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

2 major / 6 minor

Summary. The paper reports a qualitative re-analysis of semi-structured interviews with 30 blind and low-vision software professionals (BLVSPs), using reflexive thematic analysis informed by Amabile's componential model of creativity. The authors identify six themes: motivation driven by need, creation of opportunities, creation of tools, use and customization of tools, workflow strategies, and communities/sharing. The central claim, stated in the abstract, is that creative problem-solving is essential for BLVSPs to navigate inaccessible work environments, in contrast to sighted peers, who pursue optimization. The paper positions itself as the first study of creativity in the workplace experiences of BLVSPs and offers implications for organizations, tool builders, and communities.

Significance. If accepted with the comparative claim appropriately bounded, the paper is a meaningful qualitative contribution at the intersection of software engineering creativity research and accessibility research. Its strengths include a reasonably large interview sample for this population (30 participants), a documented two-phase coding process with multiple coders, explicit researcher reflexivity, a public protocol/codebook link, and an honest threat-to-validity discussion that acknowledges partial data saturation. The six themes are grounded in participant quotes and align with prior work on invisible access labor and DIY accessibility solutions. The descriptive finding that BLVSPs' creativity is often necessity-driven and community-supported is credible and useful for practitioners. The main weakness is that the abstract and parts of the discussion assert a categorical difference from sighted professionals that the study's design cannot support; this is fixable by softening or removing the unsupported comparative framing.

major comments (2)
  1. [Abstract and Section V (Discussion)] The categorical contrast with sighted peers, stated in the abstract as 'in contrast to sighted peers, who pursue optimization,' is not supported by the study's data. The paper reports interviews with 30 BLVSPs but collected no data from sighted developers and cites no empirical baseline establishing that sighted professionals' creative problem-solving is primarily optimization-oriented. The Discussion itself hedges this point ('While sighted professionals might employ creative solutions to optimize or improve their workflows'), so the abstract hardens an unsupported 'might' into a claim of fact. Because this contrast is part of the paper's central concluding claim, it is load-bearing. The authors should either remove the comparative assertion and describe BLVSPs' creativity as essential and necessity-driven, or provide direct comparative evidence or a defensible cited baseline for the sighted comparison.
  2. [Section V (Discussion) and Section II (Related Work)] The comparison in the Discussion is also in tension with the paper's own cited literature. The authors cite Groeneveld et al. [3] and Inman et al. [23] to characterize developer creativity as involving clever reuse, problem reframing, exploration, and usefulness, not merely optimization. The dichotomy in the Discussion—BLVSPs create out of necessity, sighted professionals optimize—therefore conflicts with the characterization of creativity in the related work the authors themselves rely on. This makes the comparative claim internally inconsistent, not merely unproven. A more defensible framing would contrast the mandatory, access-critical nature of creativity for BLVSPs with its more optional, improvement-oriented role for other professionals, without asserting a categorical difference in the content or motivation of sighted developers' creativity.
minor comments (6)
  1. [Section V] The opening phrase 'A distinctive aspect of LVSPs' appears to be missing the initial B; it should read 'BLVSPs.'
  2. [Section IV-C] The quote about the video positioning tool lacks a participant identifier (e.g., P-number), whereas most other quotes in the Findings include one; adding the identifier would improve consistency and auditability.
  3. [References] References [14] and [35] are the same source (Armaly, Rodeghero, and McMillan, 'A comparison of program comprehension strategies by blind and sighted programmers'); they should be consolidated into a single citation.
  4. [Section III-C] The description of abductive analysis could be clearer about how Amabile's model was used to derive themes without constraining inductive discovery; the linked codebook helps, but a sentence explaining how conflicts between inductive and deductive coding were resolved would strengthen the methods section.
  5. [Section VI] The authors acknowledge that 'full saturation was not reached,' but this caveat is not reflected in the strength of some conclusions, such as the claim that creative problem-solving is 'essential' for BLVSPs. Softening Conclusion statements to 'participants in this study' or 'the interviewed BLVSPs' would align the claims with the stated saturation limitation.
  6. [Section III-B] Demographic information (vision status, country, gender) is reported in prose; a summary table of participant characteristics and professional roles would improve transferability and make the diversity of the sample easier to assess.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity; the paper's qualitative themes are grounded in participant data, and its self-citations are not load-bearing.

full rationale

This is a qualitative, interview-based study, so there is no mathematical derivation or fitted parameter to inspect. The authors explicitly disclose that the 30 interviews were originally collected for a prior DIY-solutions study and that the present paper is a re-analysis with creativity as the focus; the themes reported in Table I and Section IV are drawn from participant responses and coded through reflexive thematic analysis, not derived from the prior paper's conclusions. The use of Amabile's componential model is a stated analytical lens, not an imported result that determines the findings. Self-citations such as [11], [15], and [32] provide background and prior data collection details, but the central claim about BLVSPs' necessity-driven creative problem-solving rests on the interview evidence itself. The abstract's contrast with sighted peers ('in contrast to sighted peers, who pursue optimization') is not supported by data collected in this study and is hedged in the Discussion ('While sighted professionals might employ creative solutions to optimize or improve their workflows'), but this is an overgeneralization or validity concern, not a circularity concern: no conclusion is being assumed by definition or made true solely by a prior self-citation. The paper is self-contained in its qualitative analysis and does not reduce any central result to its inputs.

Assumptions & free parameters 0 free parameters · 3 assumptions · 0 invented entities

No new constructs, particles, forces, or formal objects are introduced; the paper's conceptual entities (themes, "mandatory creativity") are interpretive labels, not independent postulates.

assumptions (3)
  • domain assumption Amabile's componential model of creativity is an appropriate analytical lens for coding and interpreting BLVSP experiences.
    Section II and III.C adopt Amabile's definition; the themes are organized around its components (motivation, domain skills, social environment). If this lens is inappropriate, the thematic structure could overfit the data.
  • domain assumption Participant self-reports in semi-structured interviews accurately reflect their workplace practices.
    All findings rely on what 30 participants said about their own tool use, motivations, and workflows; no observational or artifact-based verification is used.
  • domain assumption Abductive thematic analysis with a consensus codebook yields themes that generalize beyond the 30 interviewees.
    Section III.C describes the coding process; the authors also acknowledge in Section VI that full saturation was not reached, so the transferability claim rests on this assumption.

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Cite this review

Pith. "Pith review of Creative Problem-Solving: A Study with Blind and Low Vision Software Professionals." pith.science (2026). https://pith.science/paper/H3SDK5MV

@misc{pith2026250119380,
  author       = {Pith},
  title        = {Pith review of: Creative Problem-Solving: A Study with Blind and Low Vision Software Professionals},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/H3SDK5MV}},
  note         = {Machine review of arXiv:2501.19380}
}
read the original abstract

Background: Software engineering requires both technical skills and creative problem-solving. Blind and low-vision software professionals (BLVSPs) encounter numerous workplace challenges, including inaccessible tools and collaboration hurdles with sighted colleagues. Objective: This study explores the innovative strategies employed by BLVSPs to overcome these accessibility barriers, focusing on their custom solutions and the importance of supportive communities. Methodology: We conducted semi-structured interviews with 30 BLVSPs and used reflexive thematic analysis to identify key themes. Results: Findings reveal that BLVSPs are motivated to develop creative and adaptive solutions, highlighting the vital role of collaborative communities in fostering shared problem-solving. Conclusion: For BLVSPs, creative problem-solving is essential for navigating inaccessible work environments, in contrast to sighted peers, who pursue optimization. This study enhances understanding of how BLVSPs navigate accessibility challenges through innovation.

Discussion (0). Continue with ORCID to comment.

Reference graph

Works this paper leans on

41 extracted references · 38 canonical work pages

  1. [3]

    Ex ploring the role of creativity in software engineering,

    W. Groeneveld, L. Luyten, J. V ennekens, and K. Aerts, “Ex ploring the role of creativity in software engineering,” in Proceedings of the 43rd In- ternational Conference on Software Engineering: Software Engineering in Society , ser. ICSE-SEIS ’21. IEEE Press, 2021

    work page 2021

  2. [23]

    Developer pro ductivity for humans, part 8: Creativity in software engineering,

    S. Inman, S. D’Angelo, and B. V asilescu, “Developer pro ductivity for humans, part 8: Creativity in software engineering,” IEEE Software , vol. 41, no. 02, 2024

    work page 2024

  3. [1]

    Glass, Software Creativity 2.0

    R. Glass, Software Creativity 2.0 . Developer.* Books, 2006

    work page 2006

  4. [2]

    F. P . Brooks, The Mythical Man Month . Addison-Wesley, 1995

    work page 1995

  5. [4]

    Balancing betwee n creativity and efficiency in software engineering project courses,

    R. Wang, S. Milusheva, and S. Krusche, “Balancing betwee n creativity and efficiency in software engineering project courses,” in 2022 29th Asia-Pacific Software Engineering Conference (APSEC) , 2022

    work page 2022

  6. [5]

    When openness to experience and consci- entiousness are related to creative behavior: An interacti onal approach

    J. M. George and J. Zhou, “When openness to experience and consci- entiousness are related to creative behavior: An interacti onal approach.” Journal of Applied Psychology , vol. 86, no. 3, 2001

    work page 2001

  7. [6]

    P . J. Denning, “Moods,” Commun. ACM , vol. 55, no. 12, Dec. 2012

    work page 2012

  8. [7]

    The Impact Of Personality Traits And Knowled ge Col- lection Behavior On Programmer Creativity,

    A. Amin, S. Basri, M. Rehman, L. F. Capretz, R. Akbar, A. R. Gilal, and M. F. Shabbir, “The Impact Of Personality Traits And Knowled ge Col- lection Behavior On Programmer Creativity,” Information and Software Technology, vol. 128, Dec. 2020

    work page 2020

Show all 41 references
  1. [8]

    Flow Experience in Software Engineering,

    S. Ritonummi, V . Siitonen, M. Salo, H. Pirkkalainen, and A. Sivunen, “Flow Experience in Software Engineering,” in Proceedings of the 31st ACM Joint European Software Engineering Conference and Sym posium on the F oundations of Software Engineering, ser. ESEC/FSE 2023. New Y ...

    2023

  2. [9]

    How software development group leaders influence team members’ innovative behavior,

    F. Q. da Silva, C. V . Monteiro, I. E. dos Santos, and L. F. Ca pretz, “How software development group leaders influence team members’ innovative behavior,” IEEE Software, vol. 33, no. 5, 2016

    2016

  3. [10]

    The Diversity Crisis in Software Develop- ment,

    K. Albusays, P . Bjorn, L. Dabbish, D. Ford, E. Murphy-Hi ll, A. Sere- brenik, and M.-A. Storey, “The Diversity Crisis in Software Develop- ment,” IEEE Software, vol. 38, no. 2, 2021

    2021

  4. [11]

    Understanding the career mobility of blind and low vision s oftware professionals,

    Y . Cha, V . Jackson, I. Figueira, S. M. Branham, and A. van der Hoek, “Understanding the career mobility of blind and low vision s oftware professionals,” in Proceedings of the 2024 IEEE/ACM 17th International Conference on Cooperative and Human Aspects of Software Eng ineer-...

    2024

  5. [12]

    Understanding accessibility and collaborati on in programming for people with visual impairments,

    M. Pandey, V . Kameswaran, H. V . Rao, S. O’Modhrain, and S. Oney, “Understanding accessibility and collaborati on in programming for people with visual impairments,” Proc. ACM Hum.- Comput. Interact. , vol. 5, no. CSCW1, 2021. [Online]. Available: https://doi.org/10.1145/3449203

    2021 doi

  6. [13]

    An exploratory study of b lind software developers,

    S. Mealin and E. Murphy-Hill, “An exploratory study of b lind software developers,” in 2012 IEEE Symposium on Visual Languages and Human- Centric Computing (VL/HCC) , 2012

    2012

  7. [15]

    The dilemma of building do-it-yourself (diy ) solutions for workplace accessibility,

    Y . Cha, V . Jackson, K. Kohl, R. Prikladnicki, A. van der H oek, and S. M. Branham, “The dilemma of building do-it-yourself (diy ) solutions for workplace accessibility,” arXiv preprint arXiv:2401.12345 , 2025, to appear in Proceedings of the 2025 CHI Conference on Human Fac ...

    2025 arXiv

  8. [16]

    The Standard Definition of C reativity,

    M. A. Runco and G. J. Jaeger, “The Standard Definition of C reativity,” Creativity Research Journal , vol. 24, no. 1, 2012

    2012

  9. [17]

    The dynamic componential model of creativity and innovation in organizations: Making prog ress, making meaning,

    T. M. Amabile and M. G. Pratt, “The dynamic componential model of creativity and innovation in organizations: Making prog ress, making meaning,” Research in Organizational Behavior , vol. 36, 2016

    2016

  10. [18]

    Csikszentmihalyi, Creativity: Flow and the Psychology of Discovery and Invention

    M. Csikszentmihalyi, Creativity: Flow and the Psychology of Discovery and Invention. NY , USA: HarperCollins, 2013

    2013

  11. [19]

    Assistive technology,

    “Assistive technology,” 2023. [Online]. Available: https://www.who.int/health-topics/assistive-technology

    2023

  12. [20]

    JAWS® – Freedom Scientific,

    F. Scientific, “JAWS® – Freedom Scientific,” 2025. [Onli ne]. Available: https://www.freedomscientific.com/products/software/ jaws/

    2025

  13. [21]

    About NV Access,

    N. Access, “About NV Access,” Jul. 2017. [Online]. Avai lable: https://www.nvaccess.org/about-nv-access/

    2017

  14. [22]

    Com parative study between jaws® and nvda® in academic performance of stu dents with visual impairment,

    N. Amin, A. Saeed, A. Khalid, M. Usman, and F. Akram, “Com parative study between jaws® and nvda® in academic performance of stu dents with visual impairment,” British Journal of Visual Impairment , vol. 0, no. 0, 2024

    2024

  15. [24]

    Creative Re quirements: Invention And Its Role In Requirements Engineering,

    N. Maiden, S. Robertson, and J. Robertson, “Creative Re quirements: Invention And Its Role In Requirements Engineering,” in Proceedings of the 28th international conference on Software engineeri ng, ser. ICSE ’06. New Y ork, NY , USA: ACM, 2006

    2006

  16. [25]

    How Has Design Thinking Being Used And Integrated Into Software Developme nt Ac- tivities? A Systematic Mapping,

    R. Parizi, M. Prestes, S. Marczak, and T. Conte, “How Has Design Thinking Being Used And Integrated Into Software Developme nt Ac- tivities? A Systematic Mapping,” Journal of Systems and Software , vol. 187, 2022

    2022

  17. [26]

    Happy software developers so lve problems better: psychological measurements in empirical software engineering

    A. P . Graziotin D, Wang X, “Happy software developers so lve problems better: psychological measurements in empirical software engineering.” PeerJ, 2014

    2014

  18. [27]

    What happens when software developers are (un)happy,

    D. Graziotin, F. Fagerholm, W. Xiaofeng, and P . Abraham sson, “What happens when software developers are (un)happy,” Journal of Systems and Software, vol. 140, 2018

    2018

  19. [28]

    Th e Inno- vative Behaviour of Software Engineers,

    C. V . F. Monteiro, F. Q. B. da Silva, and L. F. Capretz, “Th e Inno- vative Behaviour of Software Engineers,” in Proceedings of the 10th ACM/IEEE International Symposium on Empirical Software En gineering and Measurement, ser. ESEM ’16. New Y ork, NY , USA: ACM, 2016

    2016

  20. [29]

    The Work Life of Developers: Activities, Switches and Perc eived Productivity,

    A. N. Meyer, L. E. Barton, G. C. Murphy, T. Zimmermann, an d T. Fritz, “The Work Life of Developers: Activities, Switches and Perc eived Productivity,” IEEE Transactions on Software Engineering , vol. 43, no. 12, 2017

    2017

  21. [30]

    Understanding coordination in g lobal software engineering: A mixed-methods study on the use of meetings an d Slack,

    V . Stray and N. B. Moe, “Understanding coordination in g lobal software engineering: A mixed-methods study on the use of meetings an d Slack,” Journal of Systems and Software , vol. 170, 2020

    2020

  22. [31]

    The Invisible Work of Acces sibility: How Blind Employees Manage Accessibility in Mixed-Ability Work- places,

    S. M. Branham and S. K. Kane, “The Invisible Work of Acces sibility: How Blind Employees Manage Accessibility in Mixed-Ability Work- places,” in Proceedings of the 17th International ACM SIGACCESS Conference on Computers & Accessibility , ser. ASSETS ’15. New Y ork, NY , USA: ...

    2015

  23. [32]

    “Do Y ou Want Me to Participate or Not?

    Y . Cha, I. Figueira, J. Ayala, E. J. Edwards, J. Garcia, A . van der Hoek, and S. M. Branham, ““Do Y ou Want Me to Participate or Not?”: Investigating the accessibility of software develo pment meetings for blind and low vision professionals,” in Proceedings of the CHI Confer...

    2024

  24. [33]

    Addressing Ac cessibility Barriers in Programming for People with Visual Impairments : A Lit- erature Review,

    A. Mountapmbeme, O. Okafor, and S. Ludi, “Addressing Ac cessibility Barriers in Programming for People with Visual Impairments : A Lit- erature Review,” ACM Transactions on Accessible Computing , vol. 15, no. 1, Mar. 2022

    2022

  25. [34]

    Visual Studio Code - Code Editing. Redefined,

    “Visual Studio Code - Code Editing. Redefined,” 2025. [O nline]. Available: https://code.visualstudio.com/

    2025

  26. [35]

    A comparison of program comprehension strategies by blind and sighted programmers ,

    A. Armaly, P . Rodeghero, and C. McMillan, “A comparison of program comprehension strategies by blind and sighted programmers ,” IEEE Transactions on Software Engineering , vol. 44, no. 8, 2018

    2018

  27. [36]

    “It’s Jus t Every- thing Outside of the IDE that’s the Problem

    K. M. Storer, H. Sampath, and M. A. A. Merrick, ““It’s Jus t Every- thing Outside of the IDE that’s the Problem”: Information Se eking by Software Developers with Visual Impairments,” in Proceedings of the 2021 CHI Conference on Human Factors in Computing Systems , ser. CHI ’2...

    2021

  28. [37]

    Creative problem-solving: A study with b lind and low vision software professionals (interview protocol and cod ebook),

    K. Kohl Silveira, Y . Cha, V . Jackson, A. van der Hoek, S. B ranham, and R. Prikladnicki, “Creative problem-solving: A study with b lind and low vision software professionals (interview protocol and cod ebook),” Jan

  29. [38]

    C. B. Seaman, Qualitative Methods . London: Springer London, 2008

    2008

  30. [39]

    A guide to abductive thematic analysis

    J. Thompson, “A guide to abductive thematic analysis.” The Qualitative Report , vol. 27, no. 5, 2022. [Online]. Available: https://doi.org/10.46743/2160-3715/2022.5340

    2022

  31. [40]

    Criteria for assessing the trustworthines s of naturalistic inquiries,

    E. G. Guba, “Criteria for assessing the trustworthines s of naturalistic inquiries,” ECTJ, vol. 29, no. 2, 1981

    1981

  32. [41]

    What do we mean by “accessibility research

    K. Mack, E. McDonnell, D. Jain, L. Lu Wang, J. E. Froehlic h, and L. Findlater, “What do we mean by “accessibility research”? a literature survey of accessibility papers in chi and assets from 1994 to 2019,” in Proceedings of the 2021 CHI Conference on Human Factors in Computi...

    1994

  33. [2025]

    Available: https://doi.org/10.5281/zen odo.14740060

    [Online]. Available: https://doi.org/10.5281/zen odo.14740060

    doi

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