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  1. By: Sack, Pius,
    Type: Article
    In: Zoologische Jahrbücher
    Volume: 43
    Date: 1920
    Page Range: 235--272
    Publication Info: Jena [Germany], G. Fischer,
  2. By: Sack, Pius,
    Type: Article
    In: Archiv für Naturgeschichte
    Volume: 87
    Date: 1922
    Page Range: 258--276
    Publication Info: Berlin, Nicolai, 1912-