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  1. By: Britton, Donald M. - Catling, Paul M. - Norris, James N. - Varga, Sándor
    Type: Article
    In: The Canadian field-naturalist
    Volume: 105
    Issue: 1
    Date: 1991
    Page Range: 67--70
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Matics, R - Varga, Sándor - Opper, B - Klein, A K - Horváth, Géza, - Roulin, A - Putnoky, P - Hoffmann, G
    Type: Article
    In: The journal of raptor research
    Volume: 39
    Issue: 2
    Date: 2005
    Page Range: 142--148
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-