Typed states for the displayed outbound observations.
Source: paper_references, paper_reference_links, observed 2026-08-16T12:22:58.683836Z
Paper Citation Record · LEDGER
As of 22 August 2026, this Paper Citation Record lists 66 of 66 outbound references and 10 inbound Pith citation observations for arXiv:2504.13047.
A citation records a reference. It does not transfer a finding from one paper to another.
Typed states for the displayed outbound observations.
Source: paper_references, paper_reference_links, observed 2026-08-16T12:22:58.683836Z
One-hop event checks from named stored sources.
Source: scholarly_work_events, retraction_status_cache, observed 2026-08-22T06:32:14.747728+00:00
Pith citing papers itemized under the disclosed page cap.
Source: paper_references, paper_reference_links, observed 2026-08-15T23:49:47.832725Z
A source-named dated measurement, never combined with another source.
Source: arxiv_reference, observed 2026-07-04T19:40:06.625134Z
66 of 66 outbound references displayed
External citation measurements
No source-named external measurement is stored.
Observation eb487434-3527-4aee-a152-b2ac77fd96da · outbound
Observation of quantum entanglement between free electrons and photons Einstein, B
Reference 1
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 9849b763-0063-4776-874d-065d5c72a3a0 · outbound
Observation of quantum entanglement between free electrons and photons The mean values of the fringes are shown in dashed lines for comparison, while the shaded areas denote the 3 SD error
Reference 2
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation a2df9cdc-2167-4464-b845-adbb7f7f84d9 · outbound
Observation of quantum entanglement between free electrons and photons Unresolved cited work
Reference 3
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 44b39aee-8730-44fd-aced-5c0dfe76627b · outbound
Observation of quantum entanglement between free electrons and photons Nielsen and Isaac L
Reference 4
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 9e2f61b8-2093-4948-be6a-c7362318180a · outbound
Observation of quantum entanglement between free electrons and photons Advancesinquantummetrology
Reference 5
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation e6733545-3136-4e69-b8aa-96f8c35bf9ba · outbound
Observation of quantum entanglement between free electrons and photons Freedman and John F
Reference 6
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 93ee6b8b-bd70-4625-8f00-3780b188aabb · outbound
Observation of quantum entanglement between free electrons and photons Kwiat, Klaus Mattle, Harald Weinfurter, An- ton Zeilinger, Alexander V
Reference 7
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 9f60306a-5454-489e-84b5-1e38f4d019ae · outbound
Observation of quantum entanglement between free electrons and photons Hagley, X
Reference 8
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 460cf8af-cd57-4980-b25d-40ccfa154af7 · outbound
Observation of quantum entanglement between free electrons and photons Unresolved cited work
Reference 9
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 1cdc7ed8-30b6-4149-abdc-2051db674d49 · outbound
Observation of quantum entanglement between free electrons and photons Unresolved cited work
Reference 10
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 79b77e1e-9820-4c76-ae84-2015474fd58c · outbound
Observation of quantum entanglement between free electrons and photons Trifonov, Liang Jiang, Jared Maze, Lilian Childress, M
Reference 11
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 7965c5a1-261a-420a-bf81-9b5040af8597 · outbound
Observation of quantum entanglement between free electrons and photons Unresolved cited work
Reference 12
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 8939fda0-f74a-409d-aed9-ac96dcf5175d · outbound
Observation of quantum entanglement between free electrons and photons Unresolved cited work
Reference 13
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 2ab540e2-2f9d-49a2-af2e-7d2e199abdc0 · outbound
Observation of quantum entanglement between free electrons and photons Generation of heralded entanglementbetweendistantholespins
Reference 14
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 1744e3ff-3282-4006-b442-da0f1e476422 · outbound
Observation of quantum entanglement between free electrons and photons Unresolved cited work
Reference 15
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 124d033d-cbd6-47e9-913f-f1f86b85583e · outbound
Observation of quantum entanglement between free electrons and photons Leibrandt, Dietrich Leibfried, and Chin wen Chou
Reference 16
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 7eefde8c-7eac-4888-b8f3-336c8064bf02 · outbound
Observation of quantum entanglement between free electrons and photons Holland, Yukai Lu, and Lawrence W
Reference 17
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 46525203-1097-435c-af8b-b14f92bd95f5 · outbound
Observation of quantum entanglement between free electrons and photons Yu, Loïc Anderegg, Eunmi Chae, Wolfgang Ketterle, Kang-Kuen Ni, and John M
Reference 18
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 44f654b6-ef5b-4693-b31f-28c4c6a46a62 · outbound
Observation of quantum entanglement between free electrons and photons Observation of quantum en- tanglement with top quarks at the atlas detector.Nature, 633:542–547, 2024
Reference 19
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 9358dd73-cb7c-4b52-810d-7c60c3bdac1b · outbound
Observation of quantum entanglement between free electrons and photons Probing electron-photon entanglement using a quantum eraser
Reference 20
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation fb7f53fc-1a28-4ffb-b6b9-13a9d2458993 · outbound
Observation of quantum entanglement between free electrons and photons Spa- tial electron-photon entanglement
Reference 21
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation d1923d29-bad8-4a59-ac7e-157d11eee7e1 · outbound
Observation of quantum entanglement between free electrons and photons Bicket, Nico- lai Friis, Elizabeth Agudelo, Dennis Rätzel, and Philipp Haslinger
Reference 22
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation f9cb77be-89b7-40c4-b2dc-479303a27290 · outbound
Observation of quantum entanglement between free electrons and photons Quantum Limits of Transmission Elec- tron Microscopy.Physical Review Letters, 130(5):056101, January 2023
Reference 23
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation c7751106-2fe2-4e42-82ea-cb70f12e2784 · outbound
Observation of quantum entanglement between free electrons and photons Kruit, R
Reference 24
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 1575e270-fd2e-44dc-a36f-79fa194dce83 · outbound
Observation of quantum entanglement between free electrons and photons Koppell, Yonatan Israel, Adam J
Reference 25
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation fd135b45-b5fe-47d7-a9a6-cdda0a1f1d82 · outbound
Observation of quantum entanglement between free electrons and photons Unresolved cited work
Reference 26
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 6ab084d1-9f47-4201-90a8-15ebbcd49c82 · outbound
Observation of quantum entanglement between free electrons and photons Unresolved cited work
Reference 27
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 6c22c28a-be21-4bc8-92f0-6de9e767e58a · outbound
Observation of quantum entanglement between free electrons and photons Flannigan, and Ahmed H
Reference 28
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 7cde9f64-6f38-48ba-9ba0-8d29146576f4 · outbound
Observation of quantum entanglement between free electrons and photons Photon- induced near-field electron microscopy (PINEM): The- oretical and experimental
Reference 29
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 9389482b-38d2-4f06-bca4-2962bdb7c87a · outbound
Observation of quantum entanglement between free electrons and photons Javier García de Abajo, Ana Asenjo-Garcia, and Mathieu Kociak
Reference 30
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 2725119b-0b76-4914-9957-23a3918d74b4 · outbound
Observation of quantum entanglement between free electrons and photons Lummen, E Quiñonez, Y Murooka, B.W
Reference 31
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 7e466b7e-448e-49ce-b4fc-c9481a8cce8e · outbound
Observation of quantum entanglement between free electrons and photons Jasmin Kappert, Rui Ning Wang, Marcel Möller, Jiahe Pan, Junqiu Liu, Ofer Kfir, Claus Ropers, and Tobias J
Reference 32
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 9a78a0b2-843c-4dab-a600-65537a145232 · outbound
Observation of quantum entanglement between free electrons and photons Imprinting the quantum statistics of photons on free electrons
Reference 33
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation b868f876-335e-4f40-9f8f-895e01100433 · outbound
Observation of quantum entanglement between free electrons and photons Gaida, Hugo Lourenço-Martins, Murat Sivis, Thomas Rittmann, Armin Feist, F
Reference 34
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 96a6c7fc-807d-4c07-9175-1f7d92247536 · outbound
Observation of quantum entanglement between free electrons and photons Echternkamp, Jakob Schauss, Sergey V
Reference 35
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 010127ff-73ba-47aa-8556-5ea4d6efcb7d · outbound
Observation of quantum entanglement between free electrons and photons Freimund and Herman Batelaan
Reference 36
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation f2b52d83-d885-4bb7-b10f-4c8c8882a8de · outbound
Observation of quantum entanglement between free electrons and photons Priebe, Christopher Rathje, Sergey V
Reference 37
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 9b3e0fa4-e6fb-43bd-b7b7-fb57bb92b59a · outbound
Observation of quantum entanglement between free electrons and photons Diffraction and mi- croscopy with attosecond electron pulse trains
Reference 38
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 05c7c91d-68ac-4b5f-bbd2-4a0091cfce0f · outbound
Observation of quantum entanglement between free electrons and photons Unresolved cited work
Reference 39
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation c74d3298-5dec-4009-b7d6-1b30f472129a · outbound
Observation of quantum entanglement between free electrons and photons Tengdin, Simone Gargiulo, Enzo Rotunno, Jean-Christophe Olaya, Ido Kaminer, Vincenzo Grillo, F
Reference 40
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 7ac701bd-8b28-49bb-b56f-d4229424f8b5 · outbound
Observation of quantum entanglement between free electrons and photons Structured electrons with chiral mass and charge
Reference 41
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation d4abe087-d6f0-4b54-b31a-afcf2baa93ae · outbound
Observation of quantum entanglement between free electrons and photons Javier García de Abajo
Reference 42
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation fb595a29-b752-470d-842e-1344702a6ee0 · outbound
Observation of quantum entanglement between free electrons and photons Jas- min Kappert, Rui Ning Wang, Hugo Lourenço-Martins, Zheru Qiu, Junqiu Liu, Ofer Kfir, Tobias J
Reference 43
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 640403e9-a0ea-4797-a917-d776ae546b31 · outbound
Observation of quantum entanglement between free electrons and photons Woo, Al- berto Zobelli, Laura Bocher, Jean-Denis Blazit, Xi- aoyan Li, Marcel Tencé, Kenji Watanabe, Takashi Taniguchi, Odile Stéphan, Mathieu Kociak, and Luiz H
Reference 44
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation fcca15b2-c9b5-49eb-954a-71d027d35e87 · outbound
Observation of quantum entanglement between free electrons and photons Kippenberg, and Claus Ropers
Reference 45
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 0fea173c-911b-46c8-a806-cb1e1f7afe7e · outbound
Observation of quantum entanglement between free electrons and photons Ben Hayun, O
Reference 46
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation e1e5bf80-9477-41b5-bad3-57d71c6e224a · outbound
Observation of quantum entanglement between free electrons and photons Creation of Optical Cat and GKP States Using Shaped Free Elec- trons
Reference 47
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation a2029f2e-bbe4-45af-a18d-35c59d559cc9 · outbound
Observation of quantum entanglement between free electrons and photons Spontaneous photon emission by shaped quan- tum electron wavepackets and the QED origin of bunched electron beam superradiance
Reference 48
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 38ddda2f-3f77-4e22-a42f-2d6ad364e26b · outbound
Observation of quantum entanglement between free electrons and photons Tun- able quantum light by modulated free electrons, January 2025
Reference 49
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 78d64619-00ca-464a-91c3-714e3d2c0f8f · outbound
Observation of quantum entanglement between free electrons and photons Unresolved cited work
Reference 50
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 0ce0b5a1-fedf-4217-ad86-30a418de3d1c · outbound
Observation of quantum entanglement between free electrons and photons Javier García de Abajo
Reference 51
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 7bf0b1aa-c463-448f-9eda-f4549ddd69e7 · outbound
Observation of quantum entanglement between free electrons and photons Delayed-choice gedanken experiments and their realiza- tions
Reference 52
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 0fb98b01-e5d8-48ef-a1d2-b5dcb8586fb8 · outbound
Observation of quantum entanglement between free electrons and photons delayed choice
Reference 53
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 73d2cb63-f468-4e08-b222-d57cd7cb39da · outbound
Observation of quantum entanglement between free electrons and photons Effi- cient diffractive phase optics for electrons.New Journal of Physics, 16(9):093039, September 2014
Reference 54
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 17342534-8dc6-409a-bc7d-28ff87a064dd · outbound
Observation of quantum entanglement between free electrons and photons Johnson, Amy E
Reference 55
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 92534105-f199-4538-a8c8-592f4e11f0d3 · outbound
Observation of quantum entanglement between free electrons and photons Phase-lockedphoton–electron interaction without a laser
Reference 56
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 4d57fa14-da68-4c61-adf7-25afd356332f · outbound
Observation of quantum entanglement between free electrons and photons Iterative maximum-likelihood reconstruc- tion in quantum homodyne tomography.Journal of Op- tics B: Quantum and Semiclassical Optics , 6(6):S556, may 2004
Reference 57
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 14fee2e9-c841-43f9-bc32-67a2ea8f262c · outbound
Observation of quantum entanglement between free electrons and photons Entanglements of Electrons and Cavity Pho- tons in the Strong-Coupling Regime
Reference 58
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 1438b764-fed1-48fc-b168-6e21f028ff84 · outbound
Observation of quantum entanglement between free electrons and photons Javier García de Abajo
Reference 59
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation ef2543e5-2909-4cba-a415-5aac541209a4 · outbound
Observation of quantum entanglement between free electrons and photons Free electrons can induce entanglement be- tween photons
Reference 60
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation c9041638-8cca-459e-9365-21dddcb81567 · outbound
Observation of quantum entanglement between free electrons and photons Gaida, Sergey V
Reference 61
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 2bc5faf2-442e-409c-8f5a-2a63a903d40a · outbound
Observation of quantum entanglement between free electrons and photons Inelastic electron holog- raphy
Reference 62
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation d13fccec-ed5a-4b60-9756-9b7a4d5aad8c · outbound
Observation of quantum entanglement between free electrons and photons Potapov, J
Reference 63
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 210d8e4d-0a22-46b1-ae13-f1fdd5b58697 · outbound
Observation of quantum entanglement between free electrons and photons Quantum correla- tions in electron microscopy.Optica, 8(1):70–78, January 2021
Reference 64
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 1328467b-df61-4dda-9f8b-1dc499513c43 · outbound
Observation of quantum entanglement between free electrons and photons Myilswamy, Ryan S
Reference 65
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 0335fc6b-e435-4ab2-ba39-ff92b4bfe714 · outbound
Observation of quantum entanglement between free electrons and photons hippylib- muq: A bayesian inference software framework for in- tegration of data with complex predictive models under uncertainty
Reference 66
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 35ff57ca-b52a-4aa5-bedd-4395c91f4c8f · inbound
Femtosecond and attosecond phase-space correlations in few-particle photoelectron pulses Observation of quantum entanglement between free electrons and photons
Reference 32
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 1613033e-63b8-4ae0-83e8-e56a5c1ad98d · inbound
Two-electron quantum walks can probe entanglement and decoherence in an electron microscope Observation of quantum entanglement between free electrons and photons
Reference 27
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 27931ec9-7f2c-4985-b51e-fde6a7c9b11f · inbound
Quantum sensing and metrology with free electrons Observation of quantum entanglement between free electrons and photons
Reference 28
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation d01c18e2-99c4-457d-8952-3e096e56f864 · inbound
Spin Squeezing in Electron Microscopy Observation of quantum entanglement between free electrons and photons
Reference 82
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 6eed5078-5443-4ac4-8191-31e4485cfc2e · inbound
Tomographic reconstruction of free-electron quantum states Observation of quantum entanglement between free electrons and photons
Reference 7
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 94106f84-3ed9-48ea-8d51-9360a4b0cedc · inbound
Ghost Imaging with Free Electron-Photon Pairs Observation of quantum entanglement between free electrons and photons
Reference 43
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 14d97a39-fff4-42ab-bbd7-15f528ca37ea · inbound
Heralded Generation of Multipartite Free-Electron W-State Entanglement Observation of quantum entanglement between free electrons and photons
Reference 54
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 194a48bf-fd5f-4e07-a026-6c34a4723c1a · inbound
Electron-Photon Spatial Entanglement in Coherent Cathodoluminescence Observation of quantum entanglement between free electrons and photons
Reference 37
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation af4a0f01-52b9-40df-bac1-c11c0f3f1fb0 · inbound
Quantum tomography of free electrons Observation of quantum entanglement between free electrons and photons
Reference 17
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 84c481eb-3aa8-481a-b699-aa9d1a6c1291 · inbound
Studying electron beam coherence using plasmon interference Observation of quantum entanglement between free electrons and photons
Reference 21
Source-reported events for the cited work
Unavailable: canonical work link unavailable.