Greenhalgh's 2005 footnote 17 and her 2003 '(Song 1986: 2-3)' citation both point to the identical source — Song Jian's 1986 conference essay, pp. 2-3
Susan Greenhalgh's two articles date Song Jian's first encounter with population cybernetics to 1978 through two apparently separate routes. In the 2005 China Quarterly article, the sentence dating the encounter to "mid-1978... Helsinki... the Seventh Triennial World Congress" carries footnote 17: "Song Jian, 'Systems science and China's economic reforms' (1985), in Yang Jiachi (ed.), Control Science and Technology for Development (CSTD '85) (Oxford: Pergamon, 1986), pp. 2–3." In the 2003 Population and Development Review article, the block quotation of Song's own words — "during a visit to Europe in 1978, I happened to learn about the application of systems analysis theory..." — is cited inline "(Song 1986: 2-3)," and the article's own reference list (p. 195) confirms the full citation: Song Jian, 1986, "Systems science and China's economic reforms," in Yang Jiachi (ed.), CSTD '85 (Oxford: Pergamon), pp. 1–8.
These are not two dates that happen to match: they are one citation, pointing at the identical eight-page essay and the identical two-page span within it, cited from two different articles published two years apart. The 1976-leadership-consensus sentence in the 2005 article (claim-greenhalgh-text-concedes-1976-leadership-consensus-predates-song-cybernetics) carries no footnote of its own — only the "1978" half of that article's own "1976 predates 1978" comparison is footnoted, and that footnote resolves to the same document already identified as the source of the 2003 article's Song quotation.
This footnote 17 (p. 258) sits eight pages before, and in the same "Song discovers Europe" narrative arc as, footnote 43 — the footnote citing Kwakernaak 1977 and Olsder & Strijbos 1976 as the source of the optimal-population-target mathematics Song's group borrowed. The two footnotes cite different documents for different sub-claims (this one dates the encounter; footnote 43 names the technique) and are not substitutable: footnote 43's own sentence asserts Song discovered the Dutch work "in Europe" without a citation of its own, leaving the 1978 dating dependent entirely on this footnote and the same unread essay. Direct comparison at observation-greenhalgh-2005-footnote-17-and-43-are-confirmed-bridge-not-citation-identity.
Source
“These were the historical currents prevailing in mid-1978 when, on a visit to Helsinki, Finland to attend the Seventh Triennial World Congress of the International Federation of Automatic Control, Song encountered a radically new (to China), cybernetic-based natural science of population and its control that was tied to the well-known work of the Club of Rome.17 [fn 17: Song Jian, 'Systems science and China's economic reforms' (1985), in Yang Jiachi (ed.), Control Science and Technology for Development (CSTD '85) (Oxford: Pergamon, 1986), pp. 2-3.]”
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