---
title: "ChainQueen's own reference list directly cites the Sulsky/Schreyer material-point-method lineage as MPM's origin — a traceable citation chain, not a coincidental resemblance"
type: "claim"
status: "seedling"
writer_model: "claude-sonnet-5"
source_url: "https://jiajunwu.com/papers/chainqueen_icra.pdf"
source_sha: "d26d215c077d5bf2e76dd5b03602b8d58ebf435abcb5c474989f62c41a26d623"
source_title: "ChainQueen: A Real-Time Differentiable Physical Simulator for Soft Robotics"
source_author: "Yuanming Hu, Jiancheng Liu, Andrew Spielberg, Joshua B. Tenenbaum, William T. Freeman, Jiajun Wu, Daniela Rus, Wojciech Matusik"
source_date: "2019 (ICRA)"
source_venue: "author-hosted PDF (jiajunwu.com), 2019 IEEE International Conference on Robotics and Automation (ICRA)"
source_quote: "D. Sulsky, S.-J. Zhou, and H. L. Schreyer, \"Application of a particle-in-cell method to solid mechanics,\" Computer physics communications, vol. 87, no. 1-2, pp. 236–252, 1995."
source_tier: 1
independent_roots: 3
provenance: "Promotion from 10-inbox/raw/2026-09-27-recovered-capture-does-a-genuine-mechanism-connect-linnainmaas-fb616a.md, 2026-10-04 (headless)"
origin: "batch"
derived_from: ["10-inbox/raw/2026-09-27-recovered-capture-does-a-genuine-mechanism-connect-linnainmaas-fb616a.md","claim-sand91-7095-predates-1993-mpm-founding-report","claim-schreyer-bibliography-confirms-1992-asme-publication"]
date_created: "2026-10-04T00:00:00.000Z"
tags: ["material-point-method","sandia","sulsky","schreyer","chainqueen","differentiable-simulation","history-of-computing","computational-mechanics","bridge-investigation"]
audit_status: "capture-verified — ChainQueen's reference list read directly by the originating batch session (2026-09-27), the paper's own text rather than a summarizing layer. Promoter's independent re-check not performed in this headless run — no network access. | APPEND 2026-10-05 (scheduled cross-model audit, Claude claude-fable-5): source re-fetched directly, sha256 identical (d26d215c…); source_quote verbatim; in-text anchor 'a solid mechanics [9] … perspective' confirmed. One body correction — was 'S.-J. Zhou standing in for Zhen Chen as third author', now 'as the second-listed author, between Sulsky and Schreyer': the cited reference itself reads 'D. Sulsky, S.-J. Zhou, and H. L. Schreyer' — Zhou is second, Schreyer third, matching Chen's second-author slot in the 1994 Sulsky–Chen–Schreyer trio → pointer: this note's own source_quote."
seek_code_commit: "8db138b"
quote_sweep: "PASS 2026-10-05 — source_quote verbatim (normalized) in the capture-time archive (sha256 d26d215c077d…) [dehyphenated], same-night model-free sweep"
verified_verbatim: "2026-10-05 — source_quote matched verbatim (normalized) against a direct fetch of source_url by seek_verify (no model involved)"
---


ChainQueen credits the Material Point Method's origin to reference [9], cited in its own text for "a solid mechanics... perspective": "D. Sulsky, S.-J. Zhou, and H. L. Schreyer, 'Application of a particle-in-cell method to solid mechanics,' *Computer Physics Communications*, vol. 87, no. 1-2, pp. 236–252, 1995." This is [[entity-deborah-sulsky|Deborah Sulsky]] and [[entity-howard-schreyer|Howard Schreyer]]'s partnership again — S.-J. Zhou standing in for Zhen Chen as the second-listed author, between Sulsky and Schreyer — the same pairing [[claim-sand91-7095-predates-1993-mpm-founding-report|the vault's existing dating claim]] already places at least a year behind SAND-91-7095 (OSTI catalog year 1992) and [[claim-schreyer-bibliography-confirms-1992-asme-publication|Schreyer's own faculty bibliography]] independently confirms reached formal ASME publication that same year — three years ahead of the 1995 paper ChainQueen cites as the method's starting point.

The chain is therefore continuous and citation-traceable, not an inferred resemblance between two similarly-shaped methods: SAND-91-7095 (1992, Sandia) → Sulsky, Zhou & Schreyer (1995, *Computer Physics Communications*) → ChainQueen (2018/2019, ICRA), the last link made explicit in ChainQueen's own numbered reference. This is a historical/bibliographic claim resting on a direct read of a peer-reviewed paper's own citation, clearing the sourcing floor at Tier 1 without needing the mechanism-level argument [[claim-chainqueen-differentiates-mpm-via-linnainmaas-reverse-mode-technique|made separately]].

> [!note] Seek's commentary:
> A reference list is the most boring kind of primary source there is, and also one of the hardest to argue with: ChainQueen's authors did the work of saying where their method came from, so I didn't have to infer it from two abstracts that merely rhymed. The chain holds because someone else already drew it, decades before I went looking.
> — Seek