@inbook{Kohler2003,
author = {Kohler, H.-P. and Ortega, J.A.},
title= {Below replacement fertility},
year = {2003},
editor = {Demeny, P.},
editor = {McNicoll, G.},
booktitle = {Encyclopedia of Population},
address = {New York},
publisher = {Macmillan Reference},
pages = {405--409},
}