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Ericson Per G.P.; Jansén Anna-Lee; Johansson Ulf S. & Ekman Jan (2005): Inter-generic relationships of the crows, jays, magpies and allied groups (Aves: Corvidae) based on nucleotide sequence data. Journal of Avian Biology36: 222-234. doi:10.1111/j.0908-8857.2001.03409.xtoàn văn PDFLưu trữ 2017-08-10 tại Wayback Machine
sciencedirect.com
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Ericson Per G.P.; Jansén Anna-Lee; Johansson Ulf S. & Ekman Jan (2005): Inter-generic relationships of the crows, jays, magpies and allied groups (Aves: Corvidae) based on nucleotide sequence data. Journal of Avian Biology36: 222-234. doi:10.1111/j.0908-8857.2001.03409.xtoàn văn PDFLưu trữ 2017-08-10 tại Wayback Machine
James Helen F.; Ericson Per G.P.; Slikas Beth; Lei Fu-min & Storrs Olson (2003): Pseudopodoces humilis, a misclassified terrestrial tit (Aves: Paridae) of the Tibetan Plateau: evolutionary consequences of shifting adaptive zones. Ibis145(2): 185–202. doi:10.1046/j.1474-919X.2003.00170.xtoàn văn PDFLưu trữ 2008-12-17 tại Wayback Machine