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  1. By: Randall, J E - Williams, J T - Rocha, L A
    Type: Article
    In: Smithiana Bulletin
    Volume: 9
    Date: 2008
    Page Range: 3--13
    Publication info: Grahamstown, South Africa :South African Institute for Aquatic Biodiversity,c2002-
  2. By: Williams, J T - Smart, A M
    Type: Article
    In: Proceedings of the Biological Society of Washington.
    Volume: 96
    Date: 1983
    Page Range: 638--644
    Publication info: Washington,Biological Society of Washington