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  1. By: Isakov, I︠U︡. A.
    Type: Article
    In: The journal of the Bombay Natural History Society
    Volume: 71
    Date: 1976
    Page Range: 433--444
    Publication Info: Bombay Bombay Natural History Society 1886-
  2. By: Isakov, I︠U︡. A.
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 100
    Date: 1980
    Page Range: 55--61
    Publication Info: London, British Ornithologists' Club, 1893-