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  1. By: Poulsen, Michael K
    Type: Article
    In: Forktail
    Volume: 20
    Date: 2004
    Page Range: 29--32
    Publication Info: Oxford,
  2. By: Rasmussen, Jan F - Rahbek, Carsten - Poulsen, Bent Otto - Poulsen, Michael K - Bloch, Hanne
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 116
    Date: 1996
    Page Range: 26--46
    Publication Info: London, British Ornithologists' Club, 1893-