@article{Lichter2014,
author = {Lichter, D.T. and Sassler, S. and Turner, R.N.},
title= {Cohabitation, post-conception unions, and the rise in nonmarital fertility},
year = {2014},
doi = {10.1016/j.ssresearch.2014.04.002},
volume = {47},
pages = {134--147},
}