IUPAC Technical Report, Pure and Applied Chemistry 76(6), 1215–1225 (2004), DOI 10.1351/pac200476061215. The original title is Guidelines for calibration in analytical chemistry. Part 2. Multispecies calibration. Printed p. 1215 gives the full byline Klaus Danzer, Matthias Otto and Lloyd A. Currie; Otto is affiliated with the Department of Analytical Chemistry at TU Bergakademie Freiberg. Printed p. 1216 lists classical multivariate calibration, uncertainty, inverse calibration and error diagnosis/validation in §§2–5.