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  1. By: Duckworth, J W - Tizard, R. J. - Timmins, R. J. - Thewlis, Richard M. - Robichaud, W G - Evans, Tom D.
    Type: Article
    In: Forktail
    Volume: 13
    Date: 1998
    Page Range: 33--68
    Publication Info: Oxford,
  2. By: Duckworth, J W - Round, P D - Tizard, R. J.
    Type: Article
    In: Forktail
    Volume: 27
    Date: 2011
    Page Range: 11--14
    Publication Info: Oxford,