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  1. By: Duffels, J. P.
    Type: Article
    In: Tijdschrift voor entomologie
    Volume: 131
    Date: 1988
    Page Range: 7--12
    Publication Info: [Amsterdam], Nederlandse Entomologische Vereniging,
  2. By: Duffels, J. P.
    Type: Article
    In: Entomologische berichten
    Volume: 42
    Issue: 10
    Date: 1982
    Page Range: 156--160
    Publication Info: Amsterdam
  3. By: Duffels, J. P.
    Type: Article
    In: ZooKeys
    Volume: 61
    Date: 2010
    Page Range: 11-31
    Publication Info: Pensoft Publishers 2010
  4. By: Duffels, J. P.
    Type: Article
    In: Tijdschrift voor entomologie
    Volume: 134
    Date: 1991
    Page Range: 177--182
    Publication Info: [Amsterdam], Nederlandse Entomologische Vereniging,
  5. By: Duffels, J. P.
    Type: Article
    In: Tijdschrift voor entomologie
    Volume: 132
    Date: 1989
    Page Range: 123--127
    Publication Info: [Amsterdam], Nederlandse Entomologische Vereniging,
  6. By: Duffels, J. P.
    Type: Article
    In: Entomologische berichten
    Volume: 30
    Date: 1970
    Page Range: 9--16
    Publication Info: Amsterdam
  7. By: Duffels, J. P.
    Type: Article
    In: Entomologische berichten
    Volume: 29
    Date: 1969
    Page Range: 147--155
    Publication Info: Amsterdam