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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Allmen, H. von - Zettel, Jürg
    Type: Article
    In: Revue suisse de zoologie
    Volume: 89
    Date: 1982
    Page Range: 919--926
    Publication Info: Genève, Kundig [etc.],
  2. By: Zettel, Jürg
    Type: Article
    In: BioRisk
    Volume: 4
    Date: 2010
    Page Range: 851-854
    Publication Info: Pensoft Publishers 2010