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  1. By: Alström, Per - Colston, Peter - Olsson, Urban.
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 110
    Date: 1990
    Page Range: 43--47
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Handschuh, Markus - Zalinge, Robert N. van - Olsson, Urban. - Samphos, Phok - Chamnan, Hong - Evans, Tom D.
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 131
    Issue: 2
    Date: 2011
    Page Range: 118--122
    Publication Info: London, British Ornithologists' Club, 1893-
  3. By: Alström, Per - Olsson, Urban.
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 108
    Date: 1988
    Page Range: 12--12
    Publication Info: London, British Ornithologists' Club, 1893-
  4. By: Timmins, R. J. - Ostrowski, Stephene - Mostafawi, Naqeebullah - Noori, Hafizullah - Rajabi, Ali Madad - Svensson, Lars - Olsson, Urban. - Poole, Colin M.
    Type: Article
    In: Forktail
    Volume: 26
    Date: 2010
    Page Range: 9--23
    Publication Info: Oxford,
  5. By: Alström, Per - Olsson, Urban.
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 112
    Date: 1992
    Page Range: 111--125
    Publication Info: London, British Ornithologists' Club, 1893-
  6. By: Alström, Per - Olsson, Urban. - Colston, Peter
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 115
    Date: 1995
    Page Range: 53--57
    Publication Info: London, British Ornithologists' Club, 1893-
  7. By: Alström, Per - Olsson, Urban. - Colston, Peter
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 117
    Date: 1997
    Page Range: 177--193
    Publication Info: London, British Ornithologists' Club, 1893-
  8. By: Alström, Per - Song, Gang - Zhang, Ruiying - Gao, Xuebin - Holt, Paul I - Olsson, Urban. - Lei, Fumin
    Type: Article
    In: Forktail
    Volume: 29
    Date: 2013
    Page Range: 94--99
    Publication Info: Oxford,
  9. By: Leader, Paul J - Carey, Geoff J - Olsson, Urban. - Baral, Hem Sagar. - Alström, Per
    Type: Article
    In: Forktail
    Volume: 26
    Date: 2010
    Page Range: 121--126
    Publication Info: Oxford,
  10. By: Alström, Per - Olsson, Urban.
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 110
    Date: 1990
    Page Range: 38--43
    Publication Info: London, British Ornithologists' Club, 1893-