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  1. By: Heller, Friedrich - Linnavuori, Rauno
    Type: Article
    In: Stuttgarter Beiträge zur Naturkunde
    Volume: 186
    Date: 1968-09-05
    Page Range: 1--42
    Publication Info: Stuttgart, Das Museum,
  2. By: Dlabola, Jiří - Heller, Friedrich
    Type: Article
    In: Stuttgarter Beiträge zur Naturkunde
    Volume: 90
    Date: 1962-09-05
    Page Range: 1--8
    Publication Info: Stuttgart, Das Museum,