Key points are not available for this paper at this time.
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
Zeng et al. (Tue,) studied this question.