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  1. By: Plomp, Wouter - Portier, Bruno - Gonin, Julien
    Type: Article
    In: Bulletin of the African Bird Club
    Volume: 19
    Issue: 1
    Date: 2012-03
    Page Range: 19--24
    Publication Info: Cambridge, African Bird Club, 1994-
  2. By: Portier, Bruno - Plomp, Wouter
    Type: Article
    In: Bulletin of the African Bird Club
    Volume: 21
    Issue: 2
    Date: 2014-09
    Page Range: 169--180
    Publication Info: Cambridge, African Bird Club, 1994-