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Sangster, George; Knox, Alan G.; Helbig, Andreas J. & Parkin, David T. Taxonomic recommendations for European birds. Ibis(英语:Ibis (journal)). 2002-02-27, 144 (1): 153–159. doi:10.1046/j.0019-1019.2001.00026.x(英语).使用|accessdate=需要含有|url= (帮助)