@article{Kolk2013,
author = {Kolk, M.  and Schnettler, S. },
title= {Parental status and gender preferences for children: Is differential fertility stopping consistent with the Trivers–Willard hypothesis? },
year = {2013},
doi = {10.1017/S0021932012000557},
journal = {Journal of Biosocial Science},
volume = {45},
number = {5},
pages = {683--704},
}