@article{Hayford2016,
author = {Hayford, S.R. and Guzzo, K.B.},
title= {Fifty years of unintended births: education gradients in unintended fertility in the US, 1960–2013},
year = {2016},
doi = {10.1111/j.1728-4457.2016.00126.x},
volume = {42},
number = {2},
pages = {313--341},
}