@inbook{Williamson2003,
author = {Williamson, J.},
title= {Demographic change, economic growth, and inequality},
year = {2003},
editor = {Birdsall, N.},
editor = {Kelley, A.C.},
editor = {Sinding, S.W.},
booktitle = {Population matters},
address = {Oxford},
publisher = {Oxford University Press},
pages = {106--136},
}