@article{Zeng1993,
author = {Zeng, Y. and Tu, P. and Gu, B. and Xu, Y. and Li, B. and Li, Y.},
title= {Causes and implications of the recent increase in the reported sex ratio at birth in China},
year = {1993},
journal = {Population and Development Review},
volume = {19},
number = {283-302},
}