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Li, Shou-Hsien; Brown, Jerram L. (2000). «High frequency of extrapair fertilization in a plural breeding bird, the Mexican jay, revealed by DNA microsatellites». Animal Behaviour60 (6): 867-877. PMID11124886. S2CID34041075. doi:10.1006/anbe.2000.1554.
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Emery, Nathan; Clayton, Nicola (2004). «The Mentality of Crows: Convergent Evolution of Intelligence in Corvids and Apes». Science306 (5703): 1903-7. Bibcode:2004Sci...306.1903E. PMID15591194. S2CID9828891.
Li, Shou-Hsien; Brown, Jerram L. (2000). «High frequency of extrapair fertilization in a plural breeding bird, the Mexican jay, revealed by DNA microsatellites». Animal Behaviour60 (6): 867-877. PMID11124886. S2CID34041075. doi:10.1006/anbe.2000.1554.
Emery, Nathan; Clayton, Nicola (2004). «The Mentality of Crows: Convergent Evolution of Intelligence in Corvids and Apes». Science306 (5703): 1903-7. Bibcode:2004Sci...306.1903E. PMID15591194. S2CID9828891.