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  1. By: Hassler, E
    Type: Article
    In: Annuaire du Conservatoire et du jardin botaniques de Genève
    Volume: 21
    Date: 1919
    Page Range: 109--131
    Publication Info: Genève, Conservatoire botanique,
  2. By: Chodat, R. (Robert), - Hassler, E
    Type: Article
    In: Bulletin de l'Herbier Boissier
    Volume: 4
    Series: 2
    Date: 1904
    Page Range: 879--909
    Publication Info: Genève, Impr. Romet, 1893-1908