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  1. By: Urban, Ferdinand,
    Type: Article
    In: Archiv für Naturgeschichte
    Volume: 72
    Issue: 1
    Date: 1906
    Page Range: 33--76
    Publication Info: Berlin, Nicolai, 1835-
  2. By: Urban, Ferdinand,
    Type: Article
    In: Zoologischer Anzeiger
    Volume: 33
    Date: 1908
    Page Range: 247--252
    Publication Info: Jena VEB Gustav Fischer Verlag