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  1. By: Overal, William L
    Type: Article
    In: The University of Kansas science bulletin
    Volume: 52
    Date: 1980-06-27
    Page Range: 1--20
    Publication Info: [Lawrence], University of Kansas, [1926-1996]
  2. By: Schmidt, Justin O., - Overal, William L
    Type: Article
    In: Journal of Hymenoptera research
    Volume: 18
    Date: 2009
    Page Range: 361--367
    Publication Info: Washington, D.C, International Society of Hymenopterists, [1992-