@article{Cronk2007,
author = {Cronk, L.},
title= {Boy or girl: Gender preferences from a Darwinian point of view},
year = {2007},
doi = {10.1016/S1472-6483(10)60546-9},
journal = {Reproductive Biomedicine Online},
volume = {15},
number = {S2},
pages = {23--32},
}