@article{Bélanger2003,
author = {Bélanger, D. and Oanh, K.T.H. and Jianye, L. and Le Thanh, T. and Thanh, P.V.},
title= {Are sex ratios at birth increasing in Vietnam?},
year = {2003},
doi = {10.3917/pope.302.0231},
volume = {58},
number = {2},
pages = {231--250},
}