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  1. By: Wendelken, P W - Martin, R F
    Type: Article
    In: Bulletin of the British Ornithologists' Club.
    Volume: 106
    Date: 1986
    Page Range: 16--21
    Publication info: London :British Ornithologists' Club,1893-
  2. By: Wendelken, P W - Martin, R F
    Type: Article
    In: Bulletin of the British Ornithologists' Club.
    Volume: 109
    Date: 1989
    Page Range: 31--36
    Publication info: London :British Ornithologists' Club,1893-