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  1. By: Bijlsma, Rob G., - Van Manen, Willem - Van Der Kamp, Jan
    Type: Article
    In: Bulletin of the African Bird Club
    Volume: 12
    Issue: 2
    Date: 2005-08
    Page Range: 125--133
    Publication Info: Cambridge, African Bird Club, 1994-
  2. By: Bijlsma, Rob G., - Van Der Kamp, Jan
    Type: Article
    In: Bulletin of the African Bird Club
    Volume: 21
    Issue: 2
    Date: 2014-09
    Page Range: 212--215
    Publication Info: Cambridge, African Bird Club, 1994-