Pith. sign in

Paper Citation Record · LEDGER

Effective multipliers for weights whose log are H\"older continuous. Application to the cost of fast boundary controls for the 1D Schr{\"o}dinger equation

As of 12 August 2026, this Paper Citation Record lists 30 of 30 outbound references and 1 inbound Pith citation observation for arXiv:2502.04859.

A citation records a reference. It does not transfer a finding from one paper to another.

pith.paper-citation-record.v1
2502.04859 v1

Coverage vector

measured 30 of 30 reference resolution

Typed states for the displayed outbound observations.

Source: paper_references, paper_reference_links, observed 2026-08-08T21:21:36.679960Z

measured 31 of 31 standing notices

One-hop event checks from named stored sources.

Source: scholarly_work_events, retraction_status_cache, observed 2026-08-12T06:34:41.77262+00:00

measured 1 of 1 inbound itemization

Pith citing papers itemized under the disclosed page cap.

Source: paper_references, paper_reference_links, observed 2026-08-12T00:44:14.961473Z

measured 0 of 1 external citation measurements

A source-named dated measurement, never combined with another source.

Source: pith, observed 2026-08-12T00:44:15.098596Z

Reference resolution

30 of 30 outbound references displayed

  • verified exact0
  • verified fuzzy26
  • unresolved4
  • parse uncertain0
  • malformed identifier0
  • metadata mismatch0

External citation measurements

No source-named external measurement is stored.

Outbound references

Observation 7a8146b0-c0f0-4bae-92ad-744c8a2df72d · outbound

This paper cites On Fourier transforms of measur es with compact support.

Effective multipliers for weights whose log are H\"older continuous. Application to the cost of fast boundary controls for the 1D Schr{\"o}dinger equation On Fourier transforms of measur es with compact support

Reference 1

Resolution
verified fuzzy
raw_fallback, observed 2026-08-08T21:21:37.251959Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-12T06:34:41.77262+00:00.

source=pdf_text observed=2026-08-08T21:21:36.534188Z digest=sha256:827164d3a0d236c1703f0e4bb6153b44729b9d92a4ad2bb6c464d5a40380cc9e

Observation cbddc614-1b02-45d7-a35a-8167daf2c795 · outbound

This paper cites Control and nonlinearity , volume 136 of Mathematical Surveys and Monographs.

Effective multipliers for weights whose log are H\"older continuous. Application to the cost of fast boundary controls for the 1D Schr{\"o}dinger equation Control and nonlinearity , volume 136 of Mathematical Surveys and Monographs

Reference 2

Resolution
verified fuzzy
raw_fallback, observed 2026-08-08T21:21:37.232299Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-12T06:34:41.77262+00:00.

source=pdf_text observed=2026-08-08T21:21:36.540320Z digest=sha256:46a29cd2e86c4177ad0f2e5d1ee8123e99b96adfaf940ce65fec36dab492bf82

Observation d1a9ab54-3226-483d-b4ff-7f1f6406370d · outbound

This paper cites Singular optimal contr ol: a linear 1-D parabolic-hyperbolic example.

Effective multipliers for weights whose log are H\"older continuous. Application to the cost of fast boundary controls for the 1D Schr{\"o}dinger equation Singular optimal contr ol: a linear 1-D parabolic-hyperbolic example

Reference 3

Resolution
verified fuzzy
raw_fallback, observed 2026-08-08T21:21:37.212510Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-12T06:34:41.77262+00:00.

source=pdf_text observed=2026-08-08T21:21:36.545353Z digest=sha256:e4f9fd6ea0b4c692a46b8d16feb85cf367c934602683622eb8125460cfe6c28d

Observation fc698d58-92c0-4bea-a37e-933705a996cb · outbound

This paper cites On the cost of observability in small times for the one-dimensional heat equation.

Effective multipliers for weights whose log are H\"older continuous. Application to the cost of fast boundary controls for the 1D Schr{\"o}dinger equation On the cost of observability in small times for the one-dimensional heat equation

Reference 4

Resolution
verified fuzzy
raw_fallback, observed 2026-08-08T21:21:37.191085Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-12T06:34:41.77262+00:00.

source=pdf_text observed=2026-08-08T21:21:36.550316Z digest=sha256:f874dc5268c069ae7afe32d73ff18d65660b375fa18868c151691078898656e8

Observation db6978bd-27ea-4193-9edd-8bf0d916e80e · outbound

This paper cites Hilbert spaces of entire functions.

Effective multipliers for weights whose log are H\"older continuous. Application to the cost of fast boundary controls for the 1D Schr{\"o}dinger equation Hilbert spaces of entire functions

Reference 5

Resolution
verified fuzzy
raw_fallback, observed 2026-08-08T21:21:37.170980Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-12T06:34:41.77262+00:00.

source=pdf_text observed=2026-08-08T21:21:36.555250Z digest=sha256:ad3e049e693491d7761a28e2024295f7d2c0379b9fcabb45877953718bd7cafa

Observation 693322ca-4616-4bc1-b7c3-412651d85c81 · outbound

This paper cites Fattorini and David L.

Effective multipliers for weights whose log are H\"older continuous. Application to the cost of fast boundary controls for the 1D Schr{\"o}dinger equation Fattorini and David L

Reference 6

Resolution
verified fuzzy
raw_fallback, observed 2026-08-08T21:21:37.142189Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-12T06:34:41.77262+00:00.

source=pdf_text observed=2026-08-08T21:21:36.560447Z digest=sha256:b7d940c80db500f363199a13561a9ecb97ff481ee4853cefa26b24a93ab95a55

Observation 0e3df5be-5432-4a4c-9b4b-73cb57e8f609 · outbound

This paper cites Null and approximate controllability for weakly blowing up semilinear heat equations.

Effective multipliers for weights whose log are H\"older continuous. Application to the cost of fast boundary controls for the 1D Schr{\"o}dinger equation Null and approximate controllability for weakly blowing up semilinear heat equations

Reference 7

Resolution
verified fuzzy
raw_fallback, observed 2026-08-08T21:21:37.122866Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-12T06:34:41.77262+00:00.

source=pdf_text observed=2026-08-08T21:21:36.566439Z digest=sha256:447dffa0d1e2676d442bbdec6780986b3d14cadfe0d94f7904cca92405c09a4e

Observation a31c3d2e-5043-43ed-8860-9a781a13d331 · outbound

This paper cites Uniform controllability of a trans port equation in zero diffusion- dispersion limit.

Effective multipliers for weights whose log are H\"older continuous. Application to the cost of fast boundary controls for the 1D Schr{\"o}dinger equation Uniform controllability of a trans port equation in zero diffusion- dispersion limit

Reference 8

Resolution
verified fuzzy
raw_fallback, observed 2026-08-08T21:21:37.105918Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-12T06:34:41.77262+00:00.

source=pdf_text observed=2026-08-08T21:21:36.571384Z digest=sha256:b0b37f31a63382401abe4b89c72e5d29ebb80641995c6bd9bec6f1242a3a67ac

Observation cd86f864-6a48-4ba6-a1f5-f250935362cd · outbound

This paper cites G¨ uichal.

Effective multipliers for weights whose log are H\"older continuous. Application to the cost of fast boundary controls for the 1D Schr{\"o}dinger equation G¨ uichal

Reference 9

Resolution
verified fuzzy
raw_fallback, observed 2026-08-08T21:21:37.085753Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-12T06:34:41.77262+00:00.

source=pdf_text observed=2026-08-08T21:21:36.576484Z digest=sha256:33859f83793a94423d993255240b0a23019fdadd094e7766b52e22b9e9dfb08a

Observation 7b3c672d-769a-4129-b64d-3081bc475a57 · outbound

This paper cites A higher-dimensional Bourgain-Dyatlo v fractal uncertainty principle.

Effective multipliers for weights whose log are H\"older continuous. Application to the cost of fast boundary controls for the 1D Schr{\"o}dinger equation A higher-dimensional Bourgain-Dyatlo v fractal uncertainty principle

Reference 10

Resolution
verified fuzzy
raw_fallback, observed 2026-08-08T21:21:37.067503Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-12T06:34:41.77262+00:00.

source=pdf_text observed=2026-08-08T21:21:36.581564Z digest=sha256:7a812fa8f59adc9212762caa15cbfae4de04f597b8ca444615ffecf27c1a6d24

Observation 32911737-e998-4bfa-8912-bbfa47aa4b4d · outbound

This paper cites The uncertainty principle in harmonic analysis , volume 28 of Ergebnisse der Mathematik und ihrer Grenzgebiete (3) [Resu lts in Mathematics and Related Areas (3)].

Effective multipliers for weights whose log are H\"older continuous. Application to the cost of fast boundary controls for the 1D Schr{\"o}dinger equation The uncertainty principle in harmonic analysis , volume 28 of Ergebnisse der Mathematik und ihrer Grenzgebiete (3) [Resu lts in Mathematics and Related Areas (3)]

Reference 11

Resolution
verified fuzzy
raw_fallback, observed 2026-08-08T21:21:37.048628Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-12T06:34:41.77262+00:00.

source=pdf_text observed=2026-08-08T21:21:36.586426Z digest=sha256:167f0f5dd06e9632512240c600767b1b88d5f37e4b7cc9594859761875f5373e

Observation a8d627d5-a920-4915-8ff1-e8191feeed76 · outbound

This paper cites Admissible majorants for mod el subspaces of H 2.

Effective multipliers for weights whose log are H\"older continuous. Application to the cost of fast boundary controls for the 1D Schr{\"o}dinger equation Admissible majorants for mod el subspaces of H 2

Reference 12

Resolution
verified fuzzy
raw_fallback, observed 2026-08-08T21:21:37.030888Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-12T06:34:41.77262+00:00.

source=pdf_text observed=2026-08-08T21:21:36.591386Z digest=sha256:f1a1f7db2c9a5f59c4a846a2838c9e2da0b34a29c98f366fc44dc7fb7f49018a

Observation 978af16e-c886-44b0-a814-29b92c648abf · outbound

This paper cites The analysis of linear partial differential operators.

Effective multipliers for weights whose log are H\"older continuous. Application to the cost of fast boundary controls for the 1D Schr{\"o}dinger equation The analysis of linear partial differential operators

Reference 13

Resolution
verified fuzzy
raw_fallback, observed 2026-08-08T21:21:37.014646Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-12T06:34:41.77262+00:00.

source=pdf_text observed=2026-08-08T21:21:36.596184Z digest=sha256:fc601b93d1ed828a3a53b1b6583a324b3f9fb206ed5605f518cf6b0842b2fe3d

Observation f85fdd21-f553-4599-8bd9-f6c0355a5c26 · outbound

This paper cites Fractal uncertainty principle with e xplicit exponent.

Effective multipliers for weights whose log are H\"older continuous. Application to the cost of fast boundary controls for the 1D Schr{\"o}dinger equation Fractal uncertainty principle with e xplicit exponent

Reference 14

Resolution
verified fuzzy
raw_fallback, observed 2026-08-08T21:21:36.997662Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-12T06:34:41.77262+00:00.

source=pdf_text observed=2026-08-08T21:21:36.601954Z digest=sha256:d9786a13be1f199bed5583c4da2ec791e84604f7a2922f0f443e9fbabb9337b8

Observation 95c5e664-fb01-4a0f-8223-1139e1ec189e · outbound

This paper cites an unresolved cited work.

Effective multipliers for weights whose log are H\"older continuous. Application to the cost of fast boundary controls for the 1D Schr{\"o}dinger equation Unresolved cited work

Reference 15

Resolution
unresolved
raw_fallback, observed 2026-08-08T21:21:36.980382Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-12T06:34:41.77262+00:00.

source=pdf_text observed=2026-08-08T21:21:36.606967Z digest=sha256:d5c56aae0d02035a8ea47cd5dc209cf39bd63e2eeb369f7d4aa8f4e8f7bd74f1

Observation a891a723-09b7-438f-ab76-4a6d75457a06 · outbound

This paper cites an unresolved cited work.

Effective multipliers for weights whose log are H\"older continuous. Application to the cost of fast boundary controls for the 1D Schr{\"o}dinger equation Unresolved cited work

Reference 16

Resolution
unresolved
raw_fallback, observed 2026-08-08T21:21:36.963327Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-12T06:34:41.77262+00:00.

source=pdf_text observed=2026-08-08T21:21:36.612074Z digest=sha256:645c3953951d84176ddee1e20d23fd6a4ef33cf9ebe84bef6c2a33365c1f3827

Observation 156252f1-957d-4cff-9b13-6cc0a3df040f · outbound

This paper cites A note on Hilbert transforms.

Effective multipliers for weights whose log are H\"older continuous. Application to the cost of fast boundary controls for the 1D Schr{\"o}dinger equation A note on Hilbert transforms

Reference 17

Resolution
verified fuzzy
raw_fallback, observed 2026-08-08T21:21:36.946905Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-12T06:34:41.77262+00:00.

source=pdf_text observed=2026-08-08T21:21:36.616960Z digest=sha256:2936128f5e29423eb99c19d086ef6b697c45be9051f42ca6c10090b08cdb8dae

Observation 8e7b97d0-c99c-481b-83bb-3cebb1487b34 · outbound

This paper cites Harmonic estimation in certain slit regions and a theo rem of Beurling and Malliavin.

Effective multipliers for weights whose log are H\"older continuous. Application to the cost of fast boundary controls for the 1D Schr{\"o}dinger equation Harmonic estimation in certain slit regions and a theo rem of Beurling and Malliavin

Reference 18

Resolution
verified fuzzy
raw_fallback, observed 2026-08-08T21:21:36.930911Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-12T06:34:41.77262+00:00.

source=pdf_text observed=2026-08-08T21:21:36.621843Z digest=sha256:5cb63412976054cdfb463ac296254bbf5ff8233a91464d3257dcaeabaec466e4

Observation 11a49a0f-0af6-4b69-85a6-009473bb5863 · outbound

This paper cites The logarithmic integral.

Effective multipliers for weights whose log are H\"older continuous. Application to the cost of fast boundary controls for the 1D Schr{\"o}dinger equation The logarithmic integral

Reference 19

Resolution
verified fuzzy
raw_fallback, observed 2026-08-08T21:21:36.914739Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-12T06:34:41.77262+00:00.

source=pdf_text observed=2026-08-08T21:21:36.626812Z digest=sha256:ddd2047a7146d8652876d5d10d2fb7fb60437d011d565004e6f5d7d75a3099b5

Observation 20cabe46-156f-424c-bbcc-0e982b08cac7 · outbound

This paper cites On the cost of fast controls for some families of dis persive or parabolic equations in one space dimension.

Effective multipliers for weights whose log are H\"older continuous. Application to the cost of fast boundary controls for the 1D Schr{\"o}dinger equation On the cost of fast controls for some families of dis persive or parabolic equations in one space dimension

Reference 20

Resolution
verified fuzzy
raw_fallback, observed 2026-08-08T21:21:36.897915Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-12T06:34:41.77262+00:00.

source=pdf_text observed=2026-08-08T21:21:36.631685Z digest=sha256:31ba3a49e9743bc3d1d8eba5661b3f807d4b47f79c4eec3fbfee1a0ecced7458

Observation 8a2e99eb-d0e5-48b1-84b8-2b3576a3a46e · outbound

This paper cites an unresolved cited work.

Effective multipliers for weights whose log are H\"older continuous. Application to the cost of fast boundary controls for the 1D Schr{\"o}dinger equation Unresolved cited work

Reference 21

Resolution
unresolved
raw_fallback, observed 2026-08-08T21:21:36.881868Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-12T06:34:41.77262+00:00.

source=pdf_text observed=2026-08-08T21:21:36.636443Z digest=sha256:da297e65168f3b52aaba4184fd4fec7098be6f6a37a19c061f145c19c3225a67

Observation 24b3cd91-0d76-4664-abf7-27b39dc6e305 · outbound

This paper cites Construction of Gevrey functions with compact s upport using the Bray-Mandelbrojt iterative process and applications to the moment method in control theory.

Effective multipliers for weights whose log are H\"older continuous. Application to the cost of fast boundary controls for the 1D Schr{\"o}dinger equation Construction of Gevrey functions with compact s upport using the Bray-Mandelbrojt iterative process and applications to the moment method in control theory

Reference 22

Resolution
verified fuzzy
raw_fallback, observed 2026-08-08T21:21:36.865982Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-12T06:34:41.77262+00:00.

source=pdf_text observed=2026-08-08T21:21:36.641514Z digest=sha256:603cf52cdd1cefaa992010e58b3049209baf3dc0c804f2df242a1c07f87c1a84

Observation 3a957abc-6eac-48b5-863b-75908a0ca3d4 · outbound

This paper cites The Beurlin g-Malliavin multiplier theorem: the seventh proof.

Effective multipliers for weights whose log are H\"older continuous. Application to the cost of fast boundary controls for the 1D Schr{\"o}dinger equation The Beurlin g-Malliavin multiplier theorem: the seventh proof

Reference 23

Resolution
verified fuzzy
raw_fallback, observed 2026-08-08T21:21:36.844977Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-12T06:34:41.77262+00:00.

source=pdf_text observed=2026-08-08T21:21:36.646283Z digest=sha256:9af3915af5565ae69c27a6231c0c41ec4ac9af78f845f305425c1285f29abfdd

Observation d6ec49ed-34c5-4a08-b2a2-84b5e2bf14c1 · outbound

This paper cites Uniform boundary controllability of a semi-discrete 1- D wave equation.

Effective multipliers for weights whose log are H\"older continuous. Application to the cost of fast boundary controls for the 1D Schr{\"o}dinger equation Uniform boundary controllability of a semi-discrete 1- D wave equation

Reference 24

Resolution
verified fuzzy
raw_fallback, observed 2026-08-08T21:21:36.827579Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-12T06:34:41.77262+00:00.

source=pdf_text observed=2026-08-08T21:21:36.650885Z digest=sha256:41f33f9cfca3f6e36ea3692a44697ca48100219ef53bdcfe76d5cecbae48b8fb

Observation cfd950b9-7926-4b70-b7ed-4f6d1bd4299e · outbound

This paper cites Geometric bounds on the growth rate of null-controlla bility cost for the heat equation in small time.

Effective multipliers for weights whose log are H\"older continuous. Application to the cost of fast boundary controls for the 1D Schr{\"o}dinger equation Geometric bounds on the growth rate of null-controlla bility cost for the heat equation in small time

Reference 25

Resolution
verified fuzzy
raw_fallback, observed 2026-08-08T21:21:36.809477Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-12T06:34:41.77262+00:00.

source=pdf_text observed=2026-08-08T21:21:36.656122Z digest=sha256:ed55a5b1fb2051123cad4a7e65f3c05f4714e07c18f960af9722405f1bc2d891

Observation 30a51993-fa32-42a9-ab09-cc5ba322a051 · outbound

This paper cites How violent are fast controls for Schr¨ odinger and pla te vibrations? Arch.

Effective multipliers for weights whose log are H\"older continuous. Application to the cost of fast boundary controls for the 1D Schr{\"o}dinger equation How violent are fast controls for Schr¨ odinger and pla te vibrations? Arch

Reference 26

Resolution
verified fuzzy
raw_fallback, observed 2026-08-08T21:21:36.791789Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-12T06:34:41.77262+00:00.

source=pdf_text observed=2026-08-08T21:21:36.660891Z digest=sha256:1528b1b0cba8dfb972b4358a9ad64a9963ec27a4d3b9d82f07b22e2873af47f8

Observation 7c92bb89-fe1d-4448-8ea4-d010b2153938 · outbound

This paper cites The control transmutation method and the cost of f ast controls.

Effective multipliers for weights whose log are H\"older continuous. Application to the cost of fast boundary controls for the 1D Schr{\"o}dinger equation The control transmutation method and the cost of f ast controls

Reference 27

Resolution
verified fuzzy
raw_fallback, observed 2026-08-08T21:21:36.775148Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-12T06:34:41.77262+00:00.

source=pdf_text observed=2026-08-08T21:21:36.665593Z digest=sha256:2b72430f68c8e1c9aed5ef68cbcf4dc21f46959795c3031903c0bfa54de2c641

Observation 218d492a-c70f-464d-8791-e8dcc60b1787 · outbound

This paper cites an unresolved cited work.

Effective multipliers for weights whose log are H\"older continuous. Application to the cost of fast boundary controls for the 1D Schr{\"o}dinger equation Unresolved cited work

Reference 28

Resolution
unresolved
raw_fallback, observed 2026-08-08T21:21:36.757268Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-12T06:34:41.77262+00:00.

source=pdf_text observed=2026-08-08T21:21:36.670356Z digest=sha256:50d5130c74d275b52e71106bd311bdb439a5e9599b1862d0ac14c943be217c84

Observation 1bda186b-c89d-48d4-8408-f3fd8f276627 · outbound

This paper cites New blow-up rates for fast controls of Schr¨ odinger and heat equations.

Effective multipliers for weights whose log are H\"older continuous. Application to the cost of fast boundary controls for the 1D Schr{\"o}dinger equation New blow-up rates for fast controls of Schr¨ odinger and heat equations

Reference 29

Resolution
verified fuzzy
raw_fallback, observed 2026-08-08T21:21:36.740679Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-12T06:34:41.77262+00:00.

source=pdf_text observed=2026-08-08T21:21:36.675200Z digest=sha256:ab66c14a707ca095f657c38745a3701725dcd7ed6e5ae4e35099574baf7b8adf

Observation 32e2e086-dac3-4af5-9d9c-dce7c2f81037 · outbound

This paper cites Observation and control for operator semigroups.

Effective multipliers for weights whose log are H\"older continuous. Application to the cost of fast boundary controls for the 1D Schr{\"o}dinger equation Observation and control for operator semigroups

Reference 30

Resolution
verified fuzzy
raw_fallback, observed 2026-08-08T21:21:36.721405Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-12T06:34:41.77262+00:00.

source=pdf_text observed=2026-08-08T21:21:36.679960Z digest=sha256:1e739c10762fec5614eaebcb5f7b39333035fce36a13bc565d373a8c55cdfb39

Pith citing papers

Observation b3d87d7e-033b-467f-b890-3f836b047306 · inbound

Optimal cost of fast boundary controls for the one-dimensional heat equation cites this paper.

Optimal cost of fast boundary controls for the one-dimensional heat equation Effective multipliers for weights whose log are H\"older continuous. Application to the cost of fast boundary controls for the 1D Schr{\"o}dinger equation

Reference 25

Resolution
verified exact
local_arxiv, observed 2026-08-12T00:44:15.107933Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-12T06:34:41.77262+00:00.

source=arxiv_source observed=2026-08-12T00:44:14.961473Z digest=sha256:043aabfb73d4a68b68832b18a3e723cbdfa64711045a6d32a81d8fef1fbad2be