@article{Lopreato1988,
author = {Lopreato, Joseph and Yu, Mei-yu},
title= {Human fertility and fitness optimization},
year = {1988},
doi = {10.1016/0162-3095(88)90009-X},
journal = {Ethology and Sociobiology},
volume = {9},
number = {5},
pages = {269--289},
}