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  1. By: Richter, Hans Georg - Lowry Ii, Porter P - Oskolski, Alexei A
    Type: Article
    In: Adansonia
    Volume: 19
    Series: 4
    Issue: 1
    Date: 1997
    Page Range: 61--75
    Publication Info: Paris, Ed. scientifiques du Muséum, 1997-
  2. By: Rohwer, J. G. (Jens G.), - Richter, Hans Georg - Werff, Henk van der
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 78
    Date: 1991
    Page Range: 388--400
    Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-