@article{Becker1973,
author = {Becker, G.S. and Lewis, H.G.},
title= {On the Interaction between the Quantity and Quality of Children},
year = {1973},
doi = {10.2307/1840425},
journal = {Journal of Political Economy},
volume = {81},
number = {2},
pages = {S279--S288},
}