@article{Becker1999,
author = {Becker, G.S. and Glaeser, E.L. and Murphy, K.M. },
title= {Population and economic growth},
year = {1999},
doi = {10.1257/aer.89.2.145},
journal = {American Economic Review, Papers and Proceedings },
volume = {89},
number = {2},
pages = {145--149},
}