Zengelis at the 1921 IUPAC Conference in Brussels
Ernst Homburg, Danielle Fauque, Peter J. T. Morris, Franco Calascibetta and Santiago Alvarez published a paper in Chemistry International under the title "IUPAC in Brussels in 1921: A Historical Photo", vol. 41, iss. 3, pp. 11-15 (2019).
Complete article: PDF, DOI: 10.1515/ci-2019-0305
High resolution picture of conference participants: JPG including this image of Zengelis
Zengelis page
