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Neue Literatur
Published in Entomologische Rundschau, in 1911, in volume 28, pages 9-10
Neue Literatur
Published in Entomologische Rundschau, in 1911, in volume 28, pages 1-2
Libellen=Studien
Published in Entomologische Rundschau, in 1911, in volume 28, pages 49-50