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  1. By: Cabot, José - Serrano, P
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 106
    Date: 1986
    Page Range: 170--173
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Cabot, José - Serrano, P
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 108
    Date: 1988
    Page Range: 187--193
    Publication Info: London, British Ornithologists' Club, 1893-