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  1. By: Studer, Anita - Teixeira, Dante Martins
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 114
    Date: 1994
    Page Range: 62--63
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Studer, Anita - Vielliard, Jacques M. E.
    Type: Article
    In: Revue suisse de zoologie
    Volume: 95
    Date: 1988
    Page Range: 1063--1077
    Publication Info: Genève, Kundig [etc.],