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  1. By: Mcgowan, R Y - Massa, B
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 110
    Date: 1990
    Page Range: 64--65
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Massa, B
    Type: Article
    In: Atti della Società Italiana di Scienze Naturali e del Museo Civico di Storia Naturale in Milano
    Volume: 123
    Issue: 2-3
    Date: 1982
    Page Range: 353--374
    Publication Info: Milano, Società Italiana di Scienze Naturali ; Museo Civico di Storia Naturale in Milano,
  3. By: Massa, B
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 107
    Date: 1987
    Page Range: 118--128
    Publication Info: London, British Ornithologists' Club, 1893-