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Primary source: publications.iupac.org/pac/71/7/1331/index.html

Verified locator: IUPAC Recommendations1999, Pure and Applied Chemistry71(7),1331–1335, DOI10.1351/pac199971071331. Publisher byline D. T. Burns and A. Townshend, Abstract: extends classification to non-multiplication reactions. Original paper indexed at old.iupac.org/publications/pac/1999/71_07_pdf/burns.pdf , printed p.1332 Introduction and Direct multiplication reaction: per-cycle multiplier K gives K^n after n cycles. Direct PDF fetch403; precise primary-paper text also indexed through a CiteSeerX copy. Full identities and Hull affiliation corroborated by the same IUPAC author-index linkage and 2002 recovery paper cover.

IUPAC Recommendations2002, Pure and Applied Chemistry74(11),2201–2205, DOI10.1351/pac200274112201. Primary byline D. T. Burns, K. Danzer and A. Townshend. Abstract distinguishes extraction/preconcentration yield, called recovery, from observed/reference value after calibration, called apparent recovery.

Published PDF cover, printed p. 2201: prepared-for-publication byline Duncan Thorburn Burns, Klaus Danzer and Alan Townshend, with the first author at Queen’s University Belfast. publications.iupac.org/pac/2002/pdf/7411x2201.pdf . The PDF heading uses “terms”, while the landing-page heading uses “term”.