Greenhalgh's 2005 footnote 51 citation of Li Xiuzhen matches the vault's existing primary source, confirming the Liang and Li Xiuzhen seed notes describe the same December 1979 Chengdu conference

chinapopulation-policyone-child-policyhistoriographyliang-zhongtangli-xiuzhensong-jiangreenhalghcitation-genealogybridge-seedbridge-confirmed

A bridge-seed check tested a cosine-0.88, previously unlinked pairing between claim-liang-zhongtang-1979-two-child-proposal-and-1985-yicheng-pilot and claim-li-xiuzhen-1980-speech-frames-one-child-recommendation-as-still-being-tested. The bridge is real: both seed notes describe artifacts of one identical real-world event, not merely a thematic echo.

Greenhalgh's 2005 China Quarterly article states that "Song and Li Guangyuan presented the group's findings for the first time" at "the Second National Symposium on Population Theory, held in Chengdu from 7 to 13 December" (p. 269) — the same event the Liang seed note (via a 2016 Sixth Tone profile) calls "the Second National Demography Symposium in Chengdu, Sichuan province," where Liang Zhongtang's two-child proposal "fell on deaf ears." The identification is clinched by Greenhalgh's own footnote 51 (p. 268), which cites "Li Xiuzhen, 'Dangqian jihua shengyu gongzuo de xingshi he renwu' ('The situation and duties of birth planning work today (13 December 1979)'), Renkou yanjiu, No. 1 (1980), p. 5" — the identical title, romanization, journal, and issue the vault's existing Li Xiuzhen claim-note already treats as its Tier-1 primary source, read directly by the vault on 2026-09-10. Greenhalgh is citing the same document the vault independently read in full, and dates it to the same closing day (13 December 1979) that document's own conference report separately records.

Two seed notes an embedding model flagged only by vocabulary overlap turn out to share one calendar event, corroborated from two independent reading sessions and two different citation chains into the same primary document.