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  1. By: Spencer, W P - Williams, Justin Kirk
    Type: Article
    In: SIDA, contributions to botany
    Volume: 21
    Date: 2005
    Page Range: 1937--1938
    Publication Info: [Dallas, W. F. Mahler, etc.], 1962-
  2. By: Mayr, Ernst, - Patterson, J T - Wheeler, Marshall R. - Spencer, W P
    Type: Article
    In: The Bulletin of zoological nomenclature
    Volume: 9
    Date: 1954
    Page Range: 161--162
    Publication Info: London International Trust for Zoological Nomenclature