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  1. By: Van Rompu, E. A. - De Smet, W H - Beyens, L.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 106
    Issue: 3
    Date: 1992
    Page Range: 303--310
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Denys, L - De Smet, W H
    Type: Article
    In: Cryptogamie. Algologie
    Volume: 17
    Issue: 2
    Date: 1996
    Page Range: 77--93
    Publication Info: Paris, ADAC, 1980-2018