@article{Lawson2016,
author = {Lawson, D.W.  and Borgerhoff Mulder, M. },
title= {The offspring quantity–quality trade-off and human fertility variation},
year = {2016},
journal = {Philosophical Transactions of the Royal Society B: Biological Sciences },
volume = {371},
number = {1692},
pages = {20150145},
}