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Zur Systematik der Aphiden
Published in Tijdschrift Voor Entomologie, in 1913, in volume 56, pages 69-155
Created: 2011-02-16, modified: 2011-06-21
Nekrolog: F. M. Van der Wulp
Published in Entomologische Nachrichten, in 1900, in volume 26, pages 46-47
Created: 2017-06-15, modified: 2017-06-15