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  1. By: Nieuwkoop, P D - Lehmann, F E
    Type: Article
    In: Revue suisse de zoologie
    Volume: 59
    Date: 1952
    Page Range: 1--21
    Publication Info: Genève, Kundig [etc.],
  2. By: Nieuwkoop, P D
    Type: Article
    In: Revue suisse de zoologie
    Volume: 62
    Date: 1955
    Page Range: 367--371
    Publication Info: Genève, Kundig [etc.],