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Left to right, according to the description at File:ETH-BIB-Internationaler Mathematikerkongress, Zürich 1932-Portrait-Portr 10680-C-FL.tif:
Prof. Kogbetliantz, Dr. Silvio Cinquini, unknown (background), Prof. Szász (foreground), Prof. Blichfeldt (background), Prof. Tzitzéica (foreground, with hat), Prof. Tyler, Prof. Papaïoannou, Prof. Kiepert, at the International Congress of Mathematicians, Zürich 1932.
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