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  1. By: Buij, Ralph,
    Type: Article
    In: Forktail
    Volume: 19
    Date: 2003
    Page Range: 139--141
    Publication Info: Oxford,
  2. By: Buij, Ralph, - Clark, William S. - Allan, David G
    Type: Article
    In: Bulletin of the African Bird Club
    Volume: 23
    Issue: 1
    Date: 2016-03
    Page Range: 46--63
    Publication Info: Cambridge, African Bird Club, 1994-
  3. By: Buij, Ralph, - Croes, Barbara M
    Type: Article
    In: Bulletin of the African Bird Club
    Volume: 21
    Issue: 1
    Date: 2014-03
    Page Range: 26--63
    Publication Info: Cambridge, African Bird Club, 1994-
  4. By: Buij, Ralph, - Forsman, Dick
    Type: Article
    In: Bulletin of the African Bird Club
    Volume: 21
    Issue: 2
    Date: 2014-09
    Page Range: 141--154
    Publication Info: Cambridge, African Bird Club, 1994-
  5. By: Buij, Ralph,
    Type: Article
    In: Bulletin of the African Bird Club
    Volume: 18
    Issue: 2
    Date: 2011-09
    Page Range: 211--215
    Publication Info: Cambridge, African Bird Club, 1994-