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  1. By: Vliet, Roland E. van der - Jansen, Justin J F J
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 135
    Issue: 2
    Date: 2015
    Page Range: 121--130
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Jansen, Justin J F J - Vliet, Roland E. van der
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 135
    Issue: 2
    Date: 2015
    Page Range: 108--120
    Publication Info: London, British Ornithologists' Club, 1893-