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  1. By: Frey, H - Vogel, Peter,
    Type: Article
    In: Revue suisse de zoologie
    Volume: 86
    Date: 1979
    Page Range: 23--36
    Publication Info: Genève Kundig [etc.]
  2. By: Frey, H
    Type: Article
    In: Revue suisse de zoologie
    Volume: 87
    Date: 1980
    Page Range: 739--748
    Publication Info: Genève Kundig [etc.]
  3. By: Frey, H - Fittkau, Ernst Josef
    Type: Article
    In: Spixiana
    Volume: 11
    Date: 1988
    Page Range: 193--197
    Publication Info: Mchen, Zoologische Staatssammlung Mchen,
  4. By: Frey, H - Fittkau, Ernst Josef
    Type: Article
    In: Spixiana
    Volume: 11
    Date: 1988
    Page Range: 201--204
    Publication Info: Mchen, Zoologische Staatssammlung Mchen,
  5. By: Frey, H
    Type: Article
    In: Revue suisse de zoologie
    Volume: 86
    Date: 1979
    Page Range: 653--662
    Publication Info: Genève Kundig [etc.]