@article{Orzack2015,
author = {Orzack, S.H. and Stubblefield, J.W. and Akmaev, V.R. and Colls, P. and Munné, S. and Scholl, T. and Steinsaltz, D. and Zuckerman, J.E.},
title= {The human sex ratio from conception to birth},
year = {2015},
doi = {10.1073/pnas.1416546112},
volume = {112},
number = {16},
pages = {2102--2111},
}