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  1. By: De Beer, Gavin - Rowlands, M J
    Type: Article
    In: Bulletin of the British Museum (Natural History) Historical Series
    Volume: 2
    Issue: 6
    Date: 1961-10-24
    Page Range: 185--200
    Publication Info: London, BM(NH),
  2. By: De Beer, Gavin - Rowlands, M J - Skramovsky, B M
    Type: Article
    In: Bulletin of the British Museum (Natural History) Historical Series
    Volume: 3
    Issue: 5
    Date: 1967-03-21
    Page Range: 129--176
    Publication Info: London, BM(NH),