@article{Rosenzweig1980,
author = {Rosenzweig, M.R. and Wolpin, K.I.},
title= {Testing the quantity-quality fertility model: the use of twins as a natural experiment},
year = {1980},
doi = {10.2307/1912026},
journal = {Econometrica: journal of the Econometric Society},
volume = {48},
number = {1},
pages = {227−240},
}