@article{Zheng2012,
author = {Zheng, X. and Tan, L. and Ren, Q. and Cui, Z. and Wu, J. and Lin, T. and He, J. and Chen, H.},
title= {Trends in contraceptive patterns and behaviors during a period of fertility transition in China: 1988–2006},
year = {2012},
doi = {10.1016/j.contraception.2011.12.006},
volume = {86},
number = {3},
pages = {204--213},
}