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  1. By: Affolter, James M., - Petersen, G
    Type: Article
    In: Novon a journal of botanical nomenclature from the Missouri Botanical Garden
    Volume: 9
    Date: 1999
    Page Range: 92--94
    Publication Info: St. Louis, MO, Missouri Botanical Garden,
  2. By: Jensen, F P - Petersen, G
    Type: Article
    In: Scopus
    Volume: 9
    Date: 1985
    Page Range: 127--132
    Publication Info: Nairobi, East Africa Natural History Society's Ornithological Sub-committee,
  3. By: Petersen, G
    Type: Article
    In: Stuttgarter Beiträge zur Naturkunde
    Volume: 34
    Date: 1960
    Page Range: 1--3
    Publication Info: Stuttgart, Das Museum,