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Lived both in Denmark and outside it in the 1920s, in the 1930s in both Austria and Germany.
Zentralbibliothek Zürich, Nachlassverzeichnis Paul Kletzki [2014-05-22]
Большая биографическая энциклопедия [2013-12-28]
Ellis B. Kohs Papers, JPB 04-25, Music Division, New York Public Library for the Performing Arts [2014-05-12]
Budapest Music Center [2015-03-04]
Born in the Russian Soviet Federative Socialist Republic