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  1. By: Betancur, J - Callejas-Posada, Ricardo
    Type: Article
    In: Novon a journal of botanical nomenclature from the Missouri Botanical Garden
    Volume: 7
    Date: 1997
    Page Range: 17--24
    Publication Info: St. Louis, MO, Missouri Botanical Garden,
  2. By: Arias, Tatiana - Bornstein, Allan J. - Callejas-Posada, Ricardo
    Type: Article
    In: Novon a journal of botanical nomenclature from the Missouri Botanical Garden
    Volume: 16
    Date: 2006
    Page Range: 205--208
    Publication Info: St. Louis, MO, Missouri Botanical Garden,
  3. By: Mathieu, Guido - Symmank, Lars - Callejas-Posada, Ricardo - Wanke, Stefan - Neinhuis, Christoph - Goetghebeur, Paul - Samain, Marie-Stéphanie
    Type: Article
    In: Revista mexicana de biodiversidad
    Date: 2011-06-01