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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 : biodiversity & ecosystem risk assessment
    Volume: 4
    Date: 2010
    Page Range: 851-854
    Publication Info: Sofia, Bulgaria Pensoft