@article{Li2008,
author = {Li, Hongbin and Zhang, Junsen and Zhu, Yi},
title= {The quantity–quality trade–off of children in a developing country: Identification using Chinese twins},
year = {2008},
doi = {10.1353/dem.2008.0006},
URL = {https://doi.org/10.1353/dem.2008.0006},
volume = {45},
number = {1},
pages = {223--243},
}