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  1. By: Stamm, R A - Blum, Urs.
    Type: Article
    In: Revue suisse de zoologie
    Volume: 78
    Date: 1971
    Page Range: 671--679
    Publication Info: Genève Kundig [etc.]
  2. By: Neuckel, W - Stamm, R A
    Type: Article
    In: Revue suisse de zoologie
    Volume: 81
    Date: 1974
    Page Range: 715--722
    Publication Info: Genève Kundig [etc.]