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  1. By: Schmidt, Konrad - Westrich, Paul
    Type: Article
    In: Nachrichtenblatt der Bayerischen Entomologen
    Volume: 032
    Date: 1983
    Page Range: 118--126
    Publication Info: München, Münchner Entomologische Gesellschaft,
  2. By: Müller, Andreas - Westrich, Paul
    Type: Article
    In: Journal of Hymenoptera research
    Volume: 95
    Date: 2023
    Page Range: 215--230
    Publication Info: Washington, D.C International Society of Hymenopterists