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Sangster, George; Knox, Alan G.; Helbig, Andreas J. & Parkin, David T. (2002): Taxonomic recommendations for European birds. Ibis144(1): 153–159. doi:10.1046/j.0019-1019.2001.00026.xabstrakt
Sangster, George; Knox, Alan G.; Helbig, Andreas J. & Parkin, David T. (2002): Taxonomic recommendations for European birds. Ibis144(1): 153–159. doi:10.1046/j.0019-1019.2001.00026.xabstrakt