@inbook{Haaga2001,
author = {Haaga, J.G.},
title= {Comment: The Pace of fertility decline and the utility of evolutionary approaches},
year = {2001},
editor = {Bulatao, R.A.},
editor = {Casterline, J.B.},
booktitle = {Global Fertility Transition},
address = {New York},
publisher = {Population Council},
pages = {53--59},
}