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By: Matics, R - Varga, Sándor - Opper, B - Klein, A K - Horváth, Géza, - Roulin, A - Putnoky, P - Hoffmann, GType: ArticleIn: The journal of raptor researchVolume: 39Series:Issue: 2Date: 2005Page Range: 142--148Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: