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  1. 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-