@book{Lutz2014,
author = {Lutz, W. and Butz, B. and Kc, S.},
title= {World population and human capital in the twenty-first century},
year = {2014},
doi = {10.1093/acprof:oso/9780198703167.001.0001},
address = {Oxford},
publisher = {Oxford University Press},
}