Typed states for the displayed outbound observations.
Source: paper_references, paper_reference_links, observed 2026-08-07T05:16:03.366697Z
Paper Citation Record · LEDGER
As of 8 August 2026, this Paper Citation Record lists 71 of 71 outbound references and 6 inbound Pith citation observations for arXiv:2506.08663.
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 2026-08-07T05:16:03.366697Z
One-hop event checks from named stored sources.
Source: scholarly_work_events, retraction_status_cache, observed 2026-08-08T06:32:00.761636+00:00
Pith citing papers itemized under the disclosed page cap.
Source: paper_references, paper_reference_links, observed 2026-07-30T12:11:57.348606Z
A source-named dated measurement, never combined with another source.
Source: arxiv_reference, observed 2026-07-04T07:29:38.726296Z
71 of 71 outbound references displayed
External citation measurements
No source-named external measurement is stored.
Observation f4a115ac-8fe8-4266-baae-e57caa4a8ed7 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 1
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 05825e58-4f15-4272-b192-980c438ee820 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Universal Quantum Simulators
Reference 2
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 96fced63-0948-4d6a-8b2c-7b0debddf95c · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder & Nori, F
Reference 3
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation 545fe7fd-bfb8-4ae0-b1f3-45c992dbabfa · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder A., Altman, E., Bloch, I
Reference 4
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 45111714-c1d2-43f4-855a-1ca07ed1e0e1 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 5
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation a2c97bc8-a8a9-4fa3-bd7b-06f00d8b51b1 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder & DeMarco, B
Reference 6
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation 27529e64-a65f-48e8-9c9d-6ca90285b9c0 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 7
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation be87aa8c-bd13-4cb5-b204-f26c11ddcd31 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 8
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation 0d34bf52-a1fd-4aa0-ba20-643bcdc2b5a4 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 9
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation c48385ae-f3bc-41f7-956e-e6219c5cfb62 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 10
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 07d68882-73b9-4079-88fd-771ee7265bfe · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 11
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation eec11774-c5bc-4df5-9392-474c333c973b · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder & Manucharyan, V
Reference 12
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation de5a8bff-de00-4e7c-aed2-f9683bc432a3 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder & Nascimb` ene, S
Reference 13
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation 33a0b0b9-9139-4cbd-a496-1106f2eda8a0 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder & Roos, C
Reference 14
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation 4e00a91e-e676-4e9e-bf2e-ea8fb6cbf95e · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 15
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation 06e44fdc-c556-4100-8503-5ce0cb3e1fce · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder L., Tarbutt, M
Reference 16
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation a6a720c3-b444-4199-8e0e-e396638589f9 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 17
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 6245dbb4-3b66-4739-ae06-c3df13373d8c · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 18
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation 8d49fb5a-a2be-48ff-8348-cafe8797cfbb · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 19
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation 7f6bc873-e9ed-42de-9e3b-1638da7f3782 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder & Vandersypen, L
Reference 20
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation af965f7b-6b25-402d-81c5-1eb2941a6dc3 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 21
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation 365ebb00-ed45-4b1d-9e1c-2a23b933dd30 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 22
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation 848f722f-a619-4ab2-aabd-68db60be7ad7 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 23
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation e7f413eb-b693-4454-85fc-afdb41889901 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 24
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation ac48aa24-1d4d-4323-aebd-8ae5fa31c06e · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 25
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation 8602886d-546f-499e-a8ad-c1e44b95120c · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 26
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation 77a42800-f1ae-494d-a2d6-d3db5c484bf5 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 27
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation bc2582d6-4747-4f49-9680-9b07ba273b06 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 28
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation 1b4010a5-b72d-44f7-ab5d-cdd90e326793 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 29
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation a3f9af38-8845-4f5e-974e-ed35b91278a4 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 30
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation eaa74932-1fb1-40cf-93d5-e340c34fa717 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 31
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation cd6f40fc-b296-4b96-9289-b97f14a1d01a · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 32
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation f61d64df-a54a-4762-9692-1af891728e37 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder & Sanz, M
Reference 33
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation b1ea050c-6930-4203-8c6a-6334608317bb · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 34
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation e1742a23-d0f6-4c45-ad42-5ea0c0c52b07 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 35
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 61786ad6-c4b2-4a06-9ea0-836cc2a956ed · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 36
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation 99bb9ab5-aeb0-474f-9447-4bda91f1322d · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 37
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation 7d98bef7-a25c-423c-9418-e21f7970308b · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 38
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation 0d1f4185-a3f7-4d00-acfb-fe2988727f14 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder & Scalapino, D
Reference 39
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation d52dc21d-2ca0-4912-9d94-b9278237bdfa · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Quantum Phase Transitions in Quasi- One-Dimensional Sys- tems
Reference 40
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation 5e776ca6-0e77-4b95-bfc7-c7e01a4ebf3c · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 41
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation 36cdb3ea-cc75-4535-aac4-62e55af0b41e · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 42
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation 119b1f60-9b1a-4e72-b7cf-2587e26d6860 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 43
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation 83d7c87d-048f-4eed-9906-f25ba8f149d8 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 44
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation a9785999-656d-4ec4-9711-0215890869ac · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 45
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation 7d8b1b98-e3db-4b7c-ac8b-4ec260e00f0c · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder A., Bassi, M., Schmitt, V
Reference 46
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation e8f06b1f-d16b-41a0-98ba-c770109173d1 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder & Loss, D
Reference 47
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation a79a67cb-a9b4-49e7-ba69-89d9c08ac82e · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 48
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation edfced32-a385-4759-ace4-0b3d4ca734ef · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 49
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 5a924e5c-ca22-42ad-8f68-944f0fb333d6 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 50
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation f31cb2ca-1b82-4619-a6ac-8e9372e1fe19 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Identifying and mitigating errors in hole spin qubit readout
Reference 51
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation d43f8f13-eff6-4f46-8afc-c452ca264d41 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder G., Tokura, Y
Reference 52
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation d3d978e3-58a5-4289-a3b4-6dea86386789 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 53
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation f25490be-620f-4adb-ab12-a6184caef470 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 54
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation bea1e242-ea8f-4b92-a7eb-56bc790bd649 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 55
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation 371c4a9c-ba30-474b-90fb-73ef52ee984e · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 56
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation 9a8ab6af-0cda-4f49-9d88-e8c751e79181 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 57
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation 92ba795d-9b07-4cc7-8287-db9100eb7068 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder V., Bosco, S
Reference 58
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 1d7416fc-3467-4f04-9946-c0f190e3a603 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 59
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation 7da7c5ce-5733-4e70-8ed2-3f9579851527 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 60
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation 2f727083-7966-402a-8cde-706264fa90cd · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 61
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation 3f830988-d44e-46df-8da3-cc125159bfba · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 62
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation e4967e3b-54cb-4054-91c0-069ddf062a13 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder & Moore, J
Reference 63
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 1295cbb2-fc55-4330-9256-60edccd47dc9 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder & Huse, D
Reference 64
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation add410c6-a0fb-4d1f-bad8-cca3e6c44bec · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 65
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation 373328b5-3c51-4447-8d80-d37d94a3d3fe · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 66
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation cbe7dac4-ef1c-498a-ac1d-82f4eec55f13 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 67
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation 5eec7c6e-5887-4c06-aa2c-6f884a345281 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder Unresolved cited work
Reference 68
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 35a49bf1-a8d1-4c5c-9e22-61e3b952f59a · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder I”, the initialization point deep in the (0,2) charge state, where a singlet is initialized after a typical waiting time of 20 µs; “O
Reference 69
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation 077218f1-bef1-4403-855e-84664dd0b1a8 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder 3j was taken
Reference 70
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation 902a760a-7051-43e2-909b-a83eb3f41a52 · outbound
Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder phase boundary
Reference 71
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation b5c42f48-fa19-443a-93c9-fe5a809294f2 · inbound
Many-body interferometry with semiconductor spins Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder
Reference 20
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation 16922d29-39ee-4938-a731-97defa26b3a5 · inbound
Predicting spin-orbit coupling in hole spin qubit arrays with vision-transformer-based neural networks on a generalized Hubbard model Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder
Reference 7
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation 26b68b1a-de72-4ea9-bcde-f4e7cf46e2ae · inbound
Probing Electrostatic Disorder via g-Tensor Geometry Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder
Reference 41
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation dd6739d2-ff51-4d3f-95f0-73f3e2f32400 · inbound
Tailoring Germanium Heterostructures for Quantum Devices with Machine Learning Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder
Reference 9
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation 9f48fd99-e301-4cb3-a84b-d7a93f4d0c19 · inbound
Spin qubit operations by conveyor-mode shuttling Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder
Reference 56
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-08T06:32:00.761636+00:00.
Observation 29d389c5-75b2-447f-b913-bf97bc1a5c39 · inbound
A Degenerate Singlet-Triplet Qubit with All-Electrical Orthogonal Control Site-resolved magnon and triplon dynamics on a programmable quantum dot spin ladder
Reference 41
Source-reported events for the cited work
Unavailable: canonical work link unavailable.