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  1. By: Jahn, Olaf - Robbins, Mark B - Valenzuela, Patricio Mena - Coopmans, Paul, - Ridgely, Robert S - Schuchmann, Karl-L
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 120
    Date: 2000
    Page Range: 16--22
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Coopmans, Paul, - Krabbe, Niels
    Type: Article
    In: The Wilson bulletin
    Volume: 112
    Issue: 3
    Date: 2000-09
    Page Range: 305--312
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  3. By: Coopmans, Paul, - Krabbe, Niels - Schulenberg, Thomas S
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 121
    Date: 2001
    Page Range: 208--213
    Publication Info: London, British Ornithologists' Club, 1893-
  4. By: Mayert, Sjoerd - Coopmans, Paul, - Krabbe, Niels - Isler, Morton L
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 134
    Issue: 2
    Date: 2014
    Page Range: 145--154
    Publication Info: London, British Ornithologists' Club, 1893-