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  1. By: Drensky, P
    Type: Article
    In: Izvestiia na Tsarskitia prirodonauchni instituti v Sofiia = Mitteilungen aus den Konigl. naturwissenschaftlichen Instituten in Sofia, Bulgarien = Bulletin des Institutions royales d'histoire naturelle á Sofia, Bulgarie
    Volume: 15
    Date: 1942
    Page Range: 33--60
    Publication Info: Sofiia, Pechatnitsa P. Glushkov, 1928-
  2. By: Drensky, P
    Type: Article
    In: Entomologische Rundschau
    Volume: 28
    Date: 1911
    Page Range: 41--43
    Publication Info: Stuttgart, A. Kernen, 1909-