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  1. By: Keij, Adriaan Jan
    Type: Article
    In: Bulletin of the British Museum (Natural History) Geology
    Volume: 24
    Issue: 3
    Date: 1973-08-09
    Page Range: 215--234
    Publication Info: London, BM(NH),
  2. By: Malz, H - Keij, Adriaan Jan
    Type: Article
    In: The Bulletin of zoological nomenclature
    Volume: 44
    Date: 1987
    Page Range: 170--171
    Publication Info: London International Trust for Zoological Nomenclature