Howard Schreyer's own faculty bibliography confirms SAND-91-7095 reached formal ASME conference publication in 1992

material-point-methodsandiaschreyerprimary-source-verificationhistory-of-computingcomputational-mechanics

Howard L. Schreyer's own University of New Mexico faculty page lists, under a "1992" heading: "Sulsky D., Chen, Z., and Schreyer, H.L., 1992, 'The Application of a Material-Spatial Numerical Method to Penetration,' New Methods in Transient Analysis, AMD-Vol. 143... The American Society of Mechanical Engineers, NY, NY, 91-102." The title is identical to the one carried by SAND-91-7095's OSTI catalog record, confirming the Sandia report was not merely an internal technical document but also reached formal ASME conference publication in 1992 — a peer venue, a year ahead of the 1993/1994 founding papers.

Being the load-bearing point of the capture it comes from, this historical/priority claim needs Tier 1–2 per the sourcing floor. It clears the floor as a maker's own self-published record of his own bibliography — but Schreyer is himself one of SAND-91-7095's three authors, so this is the same author group citing itself on a different venue (his own faculty page versus OSTI's catalog), not a wholly independent third party corroborating the report's existence. Read as confirming publication and existence, not as independent verification of it.

The same page's full chronological list also shows a separate, two-author 1993 paper — Sulsky and Schreyer only, no Chen — on a related penetration topic, suggesting the "three-person collaboration" this cluster has been tracking did not hold as a fixed unit across every paper in the period.