Typed states for the displayed outbound observations.
Source: paper_references, paper_reference_links, observed 2026-07-13T04:21:42.054664Z
Paper Citation Record · LEDGER
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene
As of 17 August 2026, this Paper Citation Record lists 59 of 59 outbound references and 0 inbound Pith citation observations for arXiv:2607.09256.
A citation records a reference. It does not transfer a finding from one paper to another.
Coverage vector
One-hop event checks from named stored sources.
Source: scholarly_work_events, retraction_status_cache, observed 2026-08-17T06:30:58.91139+00:00
Pith citing papers itemized under the disclosed page cap.
Source: paper_references, paper_reference_links
A source-named dated measurement, never combined with another source.
Source: cited_works
Reference resolution
59 of 59 outbound references displayed
- verified exact1
- verified fuzzy0
- unresolved58
- parse uncertain0
- malformed identifier0
- metadata mismatch0
External citation measurements
No source-named external measurement is stored.
Outbound references
Observation 515f50ed-fa27-42c9-962d-adcfd470023e · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 1
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation c3c0801d-cbe2-465c-9585-6ae4e0c2d633 · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 2
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 67dbbeb5-bb0b-438b-974f-29b6985ec641 · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 3
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation e68b75d4-7a5d-4757-b08c-28b8e04634d6 · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 4
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation b24ac653-335d-4f05-8750-db94804015be · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 5
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 082bce3b-765f-4de8-9020-66c0f26a103f · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 6
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation f9efcd83-b3dc-4119-9aaa-05e0aa28d916 · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 7
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation eb7ecbf1-5f8f-48a4-bfde-0d5cbd489c9b · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 8
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 3c9abfe5-ab31-4bf3-a86a-f1666c36cca8 · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 9
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 9177fc01-a59e-4136-92d7-72d24f75ddea · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 10
- Resolution
- verified exact
- doi, observed 2026-07-13T04:29:19.999702Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-17T06:30:58.91139+00:00.
Observation a807343e-e4fb-4b1c-a82f-38c25e5549ae · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 11
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 971716de-77c4-4a3b-b617-e7546b31655e · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 12
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation d1650b33-1f20-4405-bf0e-3965f6fc5fa1 · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 13
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation dae1d06a-9e88-470d-a294-2a84231cb4ec · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 14
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 1673b280-ee1c-4b6f-883c-6cb1bb4557ce · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 15
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation c2754954-37e3-4e65-af34-faea998b5543 · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 16
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 9cf63c7f-7cb0-486c-9224-acf0164ea558 · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 17
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 53d9219e-c7a8-459e-b384-793955a77a32 · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 18
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 315bbcad-f687-47d0-95eb-a34c42bbb318 · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 19
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 30041433-e6dd-4258-9571-2223066dd4b5 · outbound
This paper cites Su´ arez-Rodr´ ıguez, B.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Su´ arez-Rodr´ ıguez, B
Reference 20
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 9919c87f-fa7e-497e-9c8c-427ad2feb261 · outbound
This paper cites Fontana, V.
Reference 21
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation a0f53c2c-ce52-427f-b904-4285a7774cd5 · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 22
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation af455bd0-8364-446b-ac94-489b1a658faa · outbound
This paper cites Iacovelli, P.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Iacovelli, P
Reference 23
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation fe104808-69fc-4312-baa2-49c2fbc30a7d · outbound
This paper cites M¨ onch, M.
Reference 24
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 892b2b4e-37a2-4a60-9d8b-b59c286e64ca · outbound
This paper cites Cheng, Y.
Reference 25
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 78bf073c-dedd-49b7-a151-fbb7e8693deb · outbound
This paper cites Sodemann and L.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Sodemann and L
Reference 26
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 366f8cc0-2d58-4957-821e-3a4bccf6bfd6 · outbound
This paper cites Zhang and L.
Reference 27
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation ea31b95d-9538-424a-a4ac-4e3b8afa3488 · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 28
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 40033a3b-8964-418e-8da4-461f458d598f · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 29
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 3e1af49f-1ef0-475c-b552-5eb9cb99a98a · outbound
This paper cites Ortix, Nonlinear Hall effect with time-reversal sym- metry: Theory and material realizations, Adv.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Ortix, Nonlinear Hall effect with time-reversal sym- metry: Theory and material realizations, Adv
Reference 30
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 2a2467ed-64a1-477f-896d-bf35ab360bae · outbound
This paper cites Ma, S.-Y.
Reference 31
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 63c71304-0878-4727-bf2e-2b075616f952 · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 32
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 84e0403d-0615-417e-8a1b-43b89c492187 · outbound
This paper cites Huang, Z.
Reference 33
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation a204e626-7f77-4d5e-ba0d-e57e501152d7 · outbound
This paper cites Huang, Z.
Reference 34
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 84080735-c8a6-4491-8402-e1329ee703fd · outbound
This paper cites Jiang, T.
Reference 35
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation d6b67a40-6bae-4dbb-91d7-c6a0b1a48fc2 · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 36
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation aab2991a-906c-4942-b685-6c302386b306 · outbound
This paper cites Luo, C.-H.
Reference 37
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation ecfda153-8b7b-4a3a-9291-0614cf7c0631 · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 38
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation ac6291b2-6c81-466d-ae1f-8dfa52332258 · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 39
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 944dda49-e26d-4341-8bee-c633fe2d9122 · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 40
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 6adeefa3-9404-4c3c-826d-1fbbab18ece2 · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 41
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation c310dec0-f462-461a-b074-68510258b6ee · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 42
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 25795e14-e153-4921-b9af-f6bd3fc0bdd1 · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 43
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 4648248c-9fe3-48a0-a093-bca33a2a52ff · outbound
This paper cites Ziemann, S.
Reference 44
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation d7639abb-f433-49c5-a81e-6e72c6c9afaf · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 45
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation c9cd442a-ff76-47ef-9220-29ff6454b08b · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 46
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 61d4dbf7-ebb3-4fb1-9d1d-be3a1def037d · outbound
This paper cites Hubmann, S.
Reference 47
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 62123e4c-a9fa-4119-991d-784b6fee9c83 · outbound
This paper cites Candussio, L.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Candussio, L
Reference 48
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation e2c396f7-3222-4f8a-9a13-12e8f536ba92 · outbound
This paper cites Olbrich, L.
Reference 49
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 5beaff06-2632-47e7-b863-f7b595d3ec4f · outbound
This paper cites Otteneder, S.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Otteneder, S
Reference 50
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 569416ed-2afe-4195-8f94-c7b69a33a89c · outbound
This paper cites Semiclassical theory of the photogalvanic effect in non-centrosymmetric systems.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Semiclassical theory of the photogalvanic effect in non-centrosymmetric systems
Reference 51
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation cc0ec2a0-7a27-4d3b-8b03-9438627ab4c2 · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 52
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 201056ff-0172-4349-a15f-514da91f810b · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 53
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation d1dc89f1-7c65-4ad8-90ab-32d218886e87 · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 54
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 46398bc5-b12b-4161-85d2-fdfebb9cb8f1 · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 55
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation a84ea17c-346b-4678-9eae-39ab0d7d299f · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 56
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 1518a302-5595-450a-8cd7-79591a9f9785 · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 57
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation ff4ce4a2-b890-4f1c-93e3-e5055c3a6126 · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 58
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 6aeb4b96-83b3-4b5e-b57d-f7763d1ab7d6 · outbound
This paper cites an unresolved cited work.
Terahertz field-driven nonlinear Hall effect and other second order transport phenomena in two-dimensional tellurene Unresolved cited work
Reference 59
- Resolution
- unresolved
- no resolver link, observed 2026-07-13T04:21:42.054664Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Pith citing papers
No inbound Pith citation observations are available.