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Fuchs, Jérôme; Ohlson, Jan I.; Ericson, Per G. P.; Pasquet, Eric (2007). «Synchronous intercontinental splits between assemblages of woodpeckers suggested by molecular data». Zoologica Scripta36 (1): 11-25. ISSN0300-3256. doi:10.1111/j.1463-6409.2006.00267.x.