@inbook{Kaplan2003,
author = {Kaplan, H.S. and Lancaster, J.B.},
title= {An evolutionary and ecological analysis of human fertility, mating patterns, and parental investment},
year = {2003},
editor = {Wachter, K.W.},
editor = {Bulatao, R.},
booktitle = {Offspring. Human Fertility Behaviour in Biodemographic Perspective},
address = {Washington, DC, USA},
publisher = {the National Academic Press},
pages = {170--223},
}