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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Portmann, A - Sandmeier, Esther
    Type: Article
    In: Revue suisse de zoologie
    Volume: 67
    Date: 1960
    Page Range: 159--168
    Publication Info: Genève, Kundig [etc.],
  2. By: Portmann, A - Sandmeier, Esther
    Type: Article
    In: Revue suisse de zoologie
    Volume: 72
    Date: 1965
    Page Range: 187--204
    Publication Info: Genève, Kundig [etc.],