The Wikipedia sentence naming Isaacs's RAND colleagues carries no inline citation, and neither of the article's two listed Biography references contains it

rand-corporationrufus-isaacswikipediasource-provenancecitation-tracingsourcing-critique

The sentence repeated, in whole or in part, across Wikipedia, INFORMS, and other secondary tellings of Rufus Isaacs's career — "While at RAND, he worked with researchers including Richard E. Bellman, Leonard D. Berkovitz, David H. Blackwell, John M. Danskin, Melvin Dresher, Wendell H. Fleming, Irving L. Glicksberg, Oliver A. Gross, Samuel Karlin, John W. Milnor, John F. Nash, and Lloyd S. Shapley" — carries no inline citation marker in the current Wikipedia article body, unlike the article's birth-date and Isaacs-Award sentences elsewhere, which do carry bracketed footnotes. The article's References section lists exactly two general sources for the entire Biography section: P. L. Yu's 1979 "An appreciation of professor Rufus Isaacs" (JOTA 27) and Breitner (2005), already in the vault at Tier 2 via claim-isaacs-1951-rand-paper-precursors-maximum-principle.

Both were checked against the roster sentence this session. Yu (1979) is paywalled beyond its reference list, which is a bibliography of Isaacs's own RAND-era technical output — solely authored throughout (e.g. "R. Isaacs, Games of Pursuit, The RAND Corporation, Paper No. P-257, 1951" and similar entries) — with no co-authorship or named-colleague content visible. Breitner (2005) remains accessible only as an abstract. Neither accessible portion of either reference contains the colleague-roster sentence, or the specific names Nash or Blackwell, in that context. This is the source underlying claim-isaacs-rand-colleagues-nash-blackwell-confirmed-overlap's Tier 4 leg; its documentary origin remains untraced after following the only footnote trail Wikipedia itself offers.