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  1. By: Engel, Hendrik
    Type: Article
    In: The Bulletin of zoological nomenclature
    Volume: 6
    Date: 1951
    Page Range: 3--6
    Publication Info: London International Trust for Zoological Nomenclature
  2. By: Engel, Hendrik
    Type: Article
    In: The Bulletin of zoological nomenclature
    Volume: 6
    Date: 1952
    Page Range: 292--303
    Publication Info: London International Trust for Zoological Nomenclature
  3. By: Engel, Hendrik
    Type: Article
    In: The Bulletin of zoological nomenclature
    Volume: 9
    Date: 1952
    Page Range: 158
    Publication Info: London International Trust for Zoological Nomenclature