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  1. By: Ng, Peter K. L. - Tan, Swee-Hee
    Type: Article
    In: Proceedings of the Biological Society of Washington
    Volume: 111
    Date: 1998
    Page Range: 52--80
    Publication Info: Washington Biological Society of Washington
  2. By: Ng, Peter K. L. - Tan, Swee-Hee
    Type: Article
    In: Proceedings of the Biological Society of Washington
    Volume: 112
    Date: 1999
    Page Range: 120--132
    Publication Info: Washington Biological Society of Washington