found: Platens dramatischer Nachlass, 1902:title page (Erich Petzet)
found: Die deutschen Pergament-Handschriften Nr. 1-200 der Staatsbibliothek in München, 1920:title page (beschrieben von Erich Petzet)
found: LC database, August 28, 1998(Petzet, Erich, 1870-1928)
found: Deutsche Biographie, viewed online on January 24, 2019(Petzet, Erich; librarian and literary historian; born May 3, 1870, in Breslau; died July 25, 1928, in Munich; received his Dr. phil. at the Universität München in 1892; from 1894 to 1921, he was librarian at the Bayerische Hof- und Staatsbibliothek (now the Bayerische Staatsbibliothek); area of activity: cataloging of Medieval manuscripts; also published on the works of August Graf von Platen and Paul Heyse) - https://www.deutsche-biographie.de/sfz95070.html