@article{Lawson2011,
author = {Lawson, D.W. and Mace, R.},
title= {Parental investment and the optimization of human family size},
year = {2011},
doi = {10.1098/rstb.2010.0297},
journal = {Philosophical Transactions of the Royal Society B: Biological Sciences},
volume = {366},
number = {1563},
pages = {333--343},
}