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  1. By: Archangelsky, Sergio - Wagner, R. H. (Robert Hermann)
    Type: Article
    In: Bulletin of the British Museum (Natural History) Geology
    Volume: 37
    Issue: 3
    Date: 1983-11-24
    Page Range: 81--91
    Publication Info: London, BM(NH),
  2. By: Wagner, R. H. (Robert Hermann) - Castro, M. P.
    Type: Article
    In: Palaeontology
    Volume: 41
    Date: 1998
    Page Range: 1--22
    Publication Info: London, Palaeontological Association, 1957-