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  1. By: Verkerke, W.
    Type: Article
    In: Bulletin du Muséum National d'Histoire Naturelle Section B,Adansonia, botanique, phytochimie
    Volume: 13
    Issue: 1
    Date: 1991
    Page Range: 9--12
    Publication Info: Paris, Muséum National d'Histoire Naturelle, 1981-1996
  2. By: Verkerke, W.
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 66
    Issue: 3
    Date: 1985
    Page Range: 353--394
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-