@inbook{Goldstein2009,
author = {Goldstein, J.R. },
title= {How population age},
year = {2009},
doi = {10.1007/978-1-4020-8356-3_1},
editor = {Uhlenberg, P. },
booktitle = {International Handbook of Population Aging},
address = {New York},
publisher = {Springer},
pages = {7--18},
}