@inbook{Haaga2001,
author = {Haaga, J.},
title= {Comment: the pace of fertility decline and the utility of evolutionary approaches},
year = {2001},
editor = {Bulatao, R.},
editor = {Casterline, J.},
booktitle = {Global Fertility Transition, a supplement to vol. 27 of Population and Development Review},
address = {New York},
publisher = {Population Council},
pages = {53--59},
}