@article{Friedman1994,
author = {Friedman, Debra and Hechter, Michael and Kanazawa, Satoshi},
title= {A theory of the value of children},
year = {1994},
doi = {10.2307/2061749},
journal = {Demography},
volume = {31},
number = {3},
pages = {375--401},
}