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  1. By: Wiersema, John H
    Type: Article
    In: SIDA, contributions to botany.
    Volume: 9
    Date: 1982
    Page Range: 230--234
    Publication info: [Dallas :W. F. Mahler, etc.]1962-
  2. By: Wiersema, John H
    Type: Article
    In: SIDA, contributions to botany.
    Volume: 10
    Date: 1984
    Page Range: 195--198
    Publication info: [Dallas :W. F. Mahler, etc.]1962-
  3. By: Novelo Retana, Alejandro. - Wiersema, John H
    Type: Article
    In: Acta Botánica Mexicana
    Volume: 51
    Date: 2000
    Page Range: 53--60
    Publication info: México :Instituto de Ecología, A C.,1988-