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Paper Citation Record · LEDGER

PoisonCatcher: Revealing and Identifying LDP Poisoning Attacks in IIoT

As of 23 August 2026, this Paper Citation Record lists 33 of 33 outbound references and 0 inbound Pith citation observations for arXiv:2412.15704.

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

pith.paper-citation-record.v1
2412.15704 v2

Coverage vector

measured 33 of 33 reference resolution

Typed states for the displayed outbound observations.

Source: paper_references, paper_reference_links, observed 2026-08-11T11:15:24.065260Z

measured 33 of 33 standing notices

One-hop event checks from named stored sources.

Source: scholarly_work_events, retraction_status_cache, observed 2026-08-23T06:30:58.430688+00:00

measured 0 of 0 inbound itemization

Pith citing papers itemized under the disclosed page cap.

Source: paper_references, paper_reference_links

measured 0 of 1 external citation measurements

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

Source: cited_works

Reference resolution

33 of 33 outbound references displayed

  • verified exact1
  • verified fuzzy30
  • unresolved1
  • parse uncertain1
  • malformed identifier0
  • metadata mismatch0

External citation measurements

No source-named external measurement is stored.

Outbound references

Observation caa842d8-063e-469a-9629-6d6a3fdc9706 · outbound

This paper cites Industrial internet of things: Recent advances, enabling technologies and open challenges.

PoisonCatcher: Revealing and Identifying LDP Poisoning Attacks in IIoT Industrial internet of things: Recent advances, enabling technologies and open challenges

Reference 1

Resolution
verified fuzzy
raw_fallback, observed 2026-08-11T11:15:24.677976Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.

source=pdf_text observed=2026-08-11T11:15:23.898258Z digest=sha256:68b583a274a03bf0b6dbf6d9fc2859c9c0fe79b10e769d84719059748a8cd6c2

Observation 1c7a8fcb-a8bf-4fe8-a5f3-7d7da3207f4b · outbound

This paper cites What can we learn privately?.

PoisonCatcher: Revealing and Identifying LDP Poisoning Attacks in IIoT What can we learn privately?

Reference 2

Resolution
verified fuzzy
raw_fallback, observed 2026-08-11T11:15:24.662090Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.

source=pdf_text observed=2026-08-11T11:15:23.903630Z digest=sha256:2bbc5dbd84d102ce5392ff6af4e4e047100c6a680993cf245290f27c08b75748

Observation 0c4f43b6-b9ba-4d6d-b9da-dccb82ce96b8 · outbound

This paper cites Local differential private data aggregation for discrete distribution estimation.

PoisonCatcher: Revealing and Identifying LDP Poisoning Attacks in IIoT Local differential private data aggregation for discrete distribution estimation

Reference 3

Resolution
verified fuzzy
raw_fallback, observed 2026-08-11T11:15:24.646010Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.

source=pdf_text observed=2026-08-11T11:15:23.908512Z digest=sha256:73b156a92895a4a49c78d5c3c1f2dd7a2230dbaed43ec5df5372c34e05617269

Observation d824bb59-8760-4d57-82c0-c034f77826fe · outbound

This paper cites Local privacy and statistical minimax rates.

PoisonCatcher: Revealing and Identifying LDP Poisoning Attacks in IIoT Local privacy and statistical minimax rates

Reference 4

Resolution
verified fuzzy
raw_fallback, observed 2026-08-11T11:15:24.630048Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.

source=pdf_text observed=2026-08-11T11:15:23.913706Z digest=sha256:7dec958a2d84b2c3e849c70fcf64796f2eec4df59ad80c6385353429a02352dc

Observation 43c2f57e-da65-463f-a926-ad10e2aa2678 · outbound

This paper cites Collecting telemetry data privately.

PoisonCatcher: Revealing and Identifying LDP Poisoning Attacks in IIoT Collecting telemetry data privately

Reference 5

Resolution
verified fuzzy
raw_fallback, observed 2026-08-11T11:15:24.611032Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.

source=pdf_text observed=2026-08-11T11:15:23.919151Z digest=sha256:a1756b6fb246c8813b40aeeb02e4b326790ebe4882e571531a36d91dc25fc893

Observation 021dc12f-d68a-41a7-aef6-3838f62326b7 · outbound

This paper cites Rappor: Randomized aggregatable privacy-preserving ordinal response.

PoisonCatcher: Revealing and Identifying LDP Poisoning Attacks in IIoT Rappor: Randomized aggregatable privacy-preserving ordinal response

Reference 6

Resolution
verified fuzzy
raw_fallback, observed 2026-08-11T11:15:24.592478Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.

source=pdf_text observed=2026-08-11T11:15:23.924113Z digest=sha256:01ccd4af9cb8ffa35386c04e4badbcff95679c590fa1dc8704f6fcfaa81c118a

Observation 677d048c-131f-4665-850c-70354ed07ab3 · outbound

This paper cites Learning with Privacy at Scale Differential.

PoisonCatcher: Revealing and Identifying LDP Poisoning Attacks in IIoT Learning with Privacy at Scale Differential

Reference 7

Resolution
verified fuzzy
raw_fallback, observed 2026-08-11T11:15:24.574084Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.

source=pdf_text observed=2026-08-11T11:15:23.929911Z digest=sha256:d172436731aadfa2c66bcbc1d1644fc9fae75bd17d034c0f372e6c37215f6609

Observation 68c17bb4-aadd-40fe-bdc2-5e286795b202 · outbound

This paper cites Local Differential Privacy for Smart Meter Data Sharing.

PoisonCatcher: Revealing and Identifying LDP Poisoning Attacks in IIoT Local Differential Privacy for Smart Meter Data Sharing

Reference 8

Resolution
verified exact
local_arxiv, observed 2026-08-11T11:15:24.139155Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.

source=pdf_text observed=2026-08-11T11:15:23.935481Z digest=sha256:676654b5f097759d46ea32025fb83ff352fdc121ee757edb243f34970acbaff3

Observation 5384700f-7c3f-4319-b3eb-a6150e4d6ced · outbound

This paper cites Local differential privacy for deep learning.

PoisonCatcher: Revealing and Identifying LDP Poisoning Attacks in IIoT Local differential privacy for deep learning

Reference 9

Resolution
verified fuzzy
raw_fallback, observed 2026-08-11T11:15:24.556987Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.

source=pdf_text observed=2026-08-11T11:15:23.940859Z digest=sha256:dc2a2ec120a0812ed38cf5ede9c5d8a81ff15bba3ac06f7fd94313285af222f1

Observation 2695d92b-4600-415f-800a-0382983614bb · outbound

This paper cites Differential privacy for industrial internet of things: Opportunities, applications, and challenges.

PoisonCatcher: Revealing and Identifying LDP Poisoning Attacks in IIoT Differential privacy for industrial internet of things: Opportunities, applications, and challenges

Reference 10

Resolution
verified fuzzy
raw_fallback, observed 2026-08-11T11:15:24.539980Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.

source=pdf_text observed=2026-08-11T11:15:23.945645Z digest=sha256:45103130f34e2882e66deee638159b482c619dfe247035868b3166da49d90ab1

Observation a6e8a2b1-3a42-42d3-a41c-21b3551964c7 · outbound

This paper cites Manipulation attacks in local differential privacy.

PoisonCatcher: Revealing and Identifying LDP Poisoning Attacks in IIoT Manipulation attacks in local differential privacy

Reference 11

Resolution
verified fuzzy
raw_fallback, observed 2026-08-11T11:15:24.521474Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.

source=pdf_text observed=2026-08-11T11:15:23.950314Z digest=sha256:62e8ebad01aff5f878458e1d86b169d243db385c6f53175e662a74bf2c80d7bb

Observation 1fc65c1b-9898-4719-937f-9d5d6c021f8f · outbound

This paper cites Data Poisoning Attacks to Local Differential Privacy Protocols.

PoisonCatcher: Revealing and Identifying LDP Poisoning Attacks in IIoT Data Poisoning Attacks to Local Differential Privacy Protocols

Reference 12

Resolution
verified fuzzy
raw_fallback, observed 2026-08-11T11:15:24.503972Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.

source=pdf_text observed=2026-08-11T11:15:23.954913Z digest=sha256:c7a3e604e5ab21430cc611183406cfa71ad86f2fad44df6cf24aa78146386dfd

Observation cde6f04d-2558-4716-aab1-21ed0f24ea56 · outbound

This paper cites Poisoning Attacks to Local Differential Privacy Protocols for Key-Value Data.

PoisonCatcher: Revealing and Identifying LDP Poisoning Attacks in IIoT Poisoning Attacks to Local Differential Privacy Protocols for Key-Value Data

Reference 13

Resolution
verified fuzzy
raw_fallback, observed 2026-08-11T11:15:24.485996Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.

source=pdf_text observed=2026-08-11T11:15:23.959616Z digest=sha256:9bc3d9536fe9b5dcdced1c7ec2bc232c239851a743741be2f273fa87961f2b52

Observation 6941b505-6d19-45c8-a820-3d892e23fc1d · outbound

This paper cites Fine-grained poisoning attack to local dif- ferential privacy protocols for mean and variance estimation.

PoisonCatcher: Revealing and Identifying LDP Poisoning Attacks in IIoT Fine-grained poisoning attack to local dif- ferential privacy protocols for mean and variance estimation

Reference 14

Resolution
verified fuzzy
raw_fallback, observed 2026-08-11T11:15:24.454599Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.

source=pdf_text observed=2026-08-11T11:15:23.970578Z digest=sha256:96cf259ad6b9dfd911222e16c1f2ddb67f614415b3be57ebd83485dc35fde05f

Observation 97fc9e19-66c2-4d20-b9d5-425bee23ff64 · outbound

This paper cites Differentially private histograms in the shuffle model from fake users.

PoisonCatcher: Revealing and Identifying LDP Poisoning Attacks in IIoT Differentially private histograms in the shuffle model from fake users

Reference 15

Resolution
verified fuzzy
raw_fallback, observed 2026-08-11T11:15:24.438892Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.

source=pdf_text observed=2026-08-11T11:15:23.976601Z digest=sha256:6d0af24f8070b239bdf144faa1778d4a2fde08397f9bf8ab182d9a725b2c8e8c

Observation b70afe49-2337-4bfa-bc79-1dfac4551fac · outbound

This paper cites Robustness of Locally Differentially Private Graph Analysis Against Poisoning.

PoisonCatcher: Revealing and Identifying LDP Poisoning Attacks in IIoT Robustness of Locally Differentially Private Graph Analysis Against Poisoning

Reference 16

Resolution
unresolved
no resolver link, observed 2026-08-11T11:15:23.981986Z

Source-reported events for the cited work

Unavailable: canonical work link unavailable.

source=pdf_text observed=2026-08-11T11:15:23.981986Z digest=sha256:d6b6ea21188f0b01e20d7cb16355c625cfcdfdc6aae974566f80e15cd2c8ca73

Observation 089015e8-1981-4336-836e-0a0b2cbce5b6 · outbound

This paper cites Preventing Manipulation Attack in Local Differential Privacy Using Verifiable Randomization Mechanism.

PoisonCatcher: Revealing and Identifying LDP Poisoning Attacks in IIoT Preventing Manipulation Attack in Local Differential Privacy Using Verifiable Randomization Mechanism

Reference 17

Resolution
verified fuzzy
raw_fallback, observed 2026-08-11T11:15:24.422700Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.

source=pdf_text observed=2026-08-11T11:15:23.989198Z digest=sha256:0f70f040e3b8ae550390da2bc4b6796e77345f03be756f84cc9c16c2b4820fb4

Observation 77218151-afdc-46f0-8c10-9d3301e83462 · outbound

This paper cites Efficient Defenses Against Output Poisoning Attacks on Local Differential Privacy.

PoisonCatcher: Revealing and Identifying LDP Poisoning Attacks in IIoT Efficient Defenses Against Output Poisoning Attacks on Local Differential Privacy

Reference 18

Resolution
verified fuzzy
raw_fallback, observed 2026-08-11T11:15:24.407052Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.

source=pdf_text observed=2026-08-11T11:15:23.993868Z digest=sha256:4737310fab8228333de559168f7442e25d7b59c5a2478c6e9593aed697e7e6ff

Observation 75a15d72-7389-4ad3-ba5c-3a6abfd795a3 · outbound

This paper cites Local Differ- ential Privacy Protocol for Making Key–Value Data Robust Against Poisoning Attacks.

PoisonCatcher: Revealing and Identifying LDP Poisoning Attacks in IIoT Local Differ- ential Privacy Protocol for Making Key–Value Data Robust Against Poisoning Attacks

Reference 19

Resolution
verified fuzzy
raw_fallback, observed 2026-08-11T11:15:24.390291Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.

source=pdf_text observed=2026-08-11T11:15:23.998625Z digest=sha256:fa2788ca830e139da5aa838123331e98b4f815829be94dfeedc6afb96429c1ae

Observation 2a005960-657b-44c0-b881-20683fdf1e64 · outbound

This paper cites LDPGuard: Defenses Against Data Poisoning At- tacks to Local Differential Privacy Protocols.

PoisonCatcher: Revealing and Identifying LDP Poisoning Attacks in IIoT LDPGuard: Defenses Against Data Poisoning At- tacks to Local Differential Privacy Protocols

Reference 20

Resolution
verified fuzzy
raw_fallback, observed 2026-08-11T11:15:24.372890Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.

source=pdf_text observed=2026-08-11T11:15:24.003714Z digest=sha256:71332817996e0e43fb1d5f4f3e4f6c1805e06ada3a6b557e3c47408a86a328ca

Observation 6648b4fc-d1a5-4faa-99bb-763d8cf64871 · outbound

This paper cites Robust Estimation Method against Poisoning Attacks for Key-Value Data with Local Differential Privacy.

PoisonCatcher: Revealing and Identifying LDP Poisoning Attacks in IIoT Robust Estimation Method against Poisoning Attacks for Key-Value Data with Local Differential Privacy

Reference 21

Resolution
verified fuzzy
raw_fallback, observed 2026-08-11T11:15:24.355097Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.

source=pdf_text observed=2026-08-11T11:15:24.008525Z digest=sha256:ca18edc2fae14ad99d09e7edb91d6a19f7564ae4aa7a012972faca2565678ef2

Observation 10e0dab0-7d16-4924-805a-feeb9f379adb · outbound

This paper cites Data Poisoning Attacks and Defenses to LDP- Based Privacy-Preserving Crowdsensing.

PoisonCatcher: Revealing and Identifying LDP Poisoning Attacks in IIoT Data Poisoning Attacks and Defenses to LDP- Based Privacy-Preserving Crowdsensing

Reference 22

Resolution
verified fuzzy
raw_fallback, observed 2026-08-11T11:15:24.338441Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.

source=pdf_text observed=2026-08-11T11:15:24.013479Z digest=sha256:dd3652586222a9ba136d22b58ef524df619e53e3fb0072b995cb8b53e663e3b1

Observation e6c2e258-c011-46bc-baa6-a1c7d7b82e2b · outbound

This paper cites A Poisoning-Resilient LDP Schema Leveraging Oblivious Transfer with the Hadamard Trans- form.

PoisonCatcher: Revealing and Identifying LDP Poisoning Attacks in IIoT A Poisoning-Resilient LDP Schema Leveraging Oblivious Transfer with the Hadamard Trans- form

Reference 23

Resolution
verified fuzzy
raw_fallback, observed 2026-08-11T11:15:24.321858Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.

source=pdf_text observed=2026-08-11T11:15:24.018287Z digest=sha256:8b43dcd41e8e68363f52ec96eaedbecb630abcdb6f0cfdb71865b7fc2f58b4ff

Observation 9acda677-5df7-4df6-83c1-5f9254307731 · outbound

This paper cites Lectures on Lipschitz analysis.

PoisonCatcher: Revealing and Identifying LDP Poisoning Attacks in IIoT Lectures on Lipschitz analysis

Reference 24

Resolution
verified fuzzy
raw_fallback, observed 2026-08-11T11:15:24.305061Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.

source=pdf_text observed=2026-08-11T11:15:24.023178Z digest=sha256:3d2b64ba3cf6613311fa5c878c41e9e510353312fc99ca5c21da2a06b90f7c05

Observation e665ed84-9347-42db-b391-a8d00a6d4050 · outbound

This paper cites Calibrating noise to sensitivity in private data analysis.

PoisonCatcher: Revealing and Identifying LDP Poisoning Attacks in IIoT Calibrating noise to sensitivity in private data analysis

Reference 25

Resolution
verified fuzzy
raw_fallback, observed 2026-08-11T11:15:24.287788Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.

source=pdf_text observed=2026-08-11T11:15:24.028918Z digest=sha256:d5455ce3974a0dae28a26fdab28e84acfe588d96bad587dbefe5d546c9490cd8

Observation 27f9b070-0440-4598-8a99-4d3b24bb1e2b · outbound

This paper cites A generalized randomized response tech- nique.

PoisonCatcher: Revealing and Identifying LDP Poisoning Attacks in IIoT A generalized randomized response tech- nique

Reference 26

Resolution
verified fuzzy
raw_fallback, observed 2026-08-11T11:15:24.269575Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.

source=pdf_text observed=2026-08-11T11:15:24.034131Z digest=sha256:42ccd82a5d6c15b64e009c2914fe4fe71021deefbdaeb3a72357f53f30b9f58a

Observation 30ba4ab0-42c9-48b3-94ad-8c706af751e1 · outbound

This paper cites Discrete distri- bution estimation under local privacy.

PoisonCatcher: Revealing and Identifying LDP Poisoning Attacks in IIoT Discrete distri- bution estimation under local privacy

Reference 27

Resolution
verified fuzzy
raw_fallback, observed 2026-08-11T11:15:24.252826Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.

source=pdf_text observed=2026-08-11T11:15:24.038954Z digest=sha256:df8fcbd71a7773d45ff4e0abd349b409f2a040f30660300892d5c271a9bc8cbb

Observation 7d57341d-be65-4e1c-b5e3-a3bf88a1527d · outbound

This paper cites Cybersecurity Challenges in Industrial Control Sys- tems.

PoisonCatcher: Revealing and Identifying LDP Poisoning Attacks in IIoT Cybersecurity Challenges in Industrial Control Sys- tems

Reference 28

Resolution
verified fuzzy
raw_fallback, observed 2026-08-11T11:15:24.232594Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.

source=pdf_text observed=2026-08-11T11:15:24.044113Z digest=sha256:2bdedfe0ed5c3e2af316c783be7a6310df752d9c1b9a8c1ec27c1eabc017d52f

Observation 04d92e6b-23df-49a3-abef-90ab0c6e255b · outbound

This paper cites Pufferfish: A framework for mathematical privacy definitions.

PoisonCatcher: Revealing and Identifying LDP Poisoning Attacks in IIoT Pufferfish: A framework for mathematical privacy definitions

Reference 29

Resolution
verified fuzzy
raw_fallback, observed 2026-08-11T11:15:24.214096Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.

source=pdf_text observed=2026-08-11T11:15:24.049110Z digest=sha256:287c6ecdc13f98ccb1fff04db0a6d03badff878a71b3a13f3de3fcc29e38982a

Observation 506d9c1b-ac14-4d31-aeab-f5a2867d7ea9 · outbound

This paper cites Differentially private aggregation of distributed time-series with transformation and encryption.

PoisonCatcher: Revealing and Identifying LDP Poisoning Attacks in IIoT Differentially private aggregation of distributed time-series with transformation and encryption

Reference 30

Resolution
verified fuzzy
raw_fallback, observed 2026-08-11T11:15:24.196402Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.

source=pdf_text observed=2026-08-11T11:15:24.054252Z digest=sha256:4646db5127d159a68e9e2d239276cc5063f31c48349f395707e96d07f1f64553

Observation 21e84891-f1b8-40c0-acb1-1cebef9f54af · outbound

This paper cites PoisonCatcher Code.

PoisonCatcher: Revealing and Identifying LDP Poisoning Attacks in IIoT PoisonCatcher Code

Reference 31

Resolution
verified fuzzy
raw_fallback, observed 2026-08-11T11:15:24.176133Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.

source=pdf_text observed=2026-08-11T11:15:24.059736Z digest=sha256:f3a512be69da610eab90ba0bf818cdc0ea016b5534a09759e869b107e4cbbd32

Observation 0ab17b67-4194-4a08-8e1e-65a122141913 · outbound

This paper cites World Weather Repository ( Daily Updating ).

PoisonCatcher: Revealing and Identifying LDP Poisoning Attacks in IIoT World Weather Repository ( Daily Updating )

Reference 32

Resolution
verified fuzzy
raw_fallback, observed 2026-08-11T11:15:24.157916Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.

source=pdf_text observed=2026-08-11T11:15:24.065260Z digest=sha256:af6a753e092b924957133fd290e453b9eac0eae6389afaac9e9e63dd23ca4edf

Observation 48a2bfaf-299f-4e14-b2dd-9989b565f2ad · outbound

This paper cites an unresolved cited work.

PoisonCatcher: Revealing and Identifying LDP Poisoning Attacks in IIoT Unresolved cited work

Reference 536

Resolution
parse uncertain
raw_fallback, observed 2026-08-11T11:15:24.469971Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.

source=pdf_text observed=2026-08-11T11:15:23.965059Z digest=sha256:263e7abdec8fb84bd2aacca3179cab9f3848da23a85ba29416471f16d9c10492

Pith citing papers

No inbound Pith citation observations are available.