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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Balls, Michael
    Type: Article
    In: Revue suisse de zoologie
    Volume: 69
    Date: 1962
    Page Range: 285--286
    Publication Info: Genève, Kundig [etc.],
  2. By: Balls, Michael
    Type: Article
    In: Revue suisse de zoologie
    Volume: 70
    Date: 1963
    Page Range: 237--244
    Publication Info: Genève, Kundig [etc.],