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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Bertelsen, Rodney D. - Weston, Donald P.
    Type: Article
    In: Proceedings of the Biological Society of Washington
    Volume: 93
    Date: 1980
    Page Range: 708--713
    Publication Info: Washington, Biological Society of Washington,
  2. By: Bertelsen, Rodney D.
    Type: Article
    In: Proceedings of the Biological Society of Washington
    Volume: 99
    Date: 1986
    Page Range: 375--379
    Publication Info: Washington, Biological Society of Washington,