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Zeng Yi, Tu Ping, Gu Baochang, Xu Yi, Li Bohua, Li Yongpiing, Causes and Implications of the Recent Increase in the Reported Sex Ratio at Birth in China, Population and Development Review, Vol. 19, No. 2 (Jun., 1993), pp. 283-302
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Zeng et al. (1993) studied this question.
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