A new and very interesting paper about the hybridization between the Greater Spotted Eagle Aquila clanga and the Lesser Spotted Eagle Aquila pomarina in Europe has recently been published and made available for download on the website by Bernd Ulrich Meyburg:
Väli, Ü., V. Dombrovski, R. Treinys, U. Bergmanis, S. J. Daróczi, M. Dravecky, V. Ivanovski, J. Lontkowski, G. Maciorowski, B.-U. Meyburg, T. Mizera, R. Zeitz & H. Ellegren 2010: Widespread hybridization between the Greater Spotted Eagle Aquila clanga and the Lesser Spotted Eagle Aquila pomarina (Aves: Accipitriformes) in Europe. Biological Journal of the Linnean Society 100: 725-736.
Also have a look at the many other interesting publications available on this website: