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Geyer, L. A.; Beauchamp, G. K.; Seygal, G. & Rogers, J. G. (1981). “Social behavior of pine voles, Microtus pinetorum: Effects of gender, familiarity, and isolation”. 《Behavioral and Neural Biology》 31 (3): 331–41. doi:10.1016/s0163-1047(81)91379-0. PMID7013754.