@article{Heiland2006,
author = {Heiland, F. and Liu, S.H.},
title= {Family structure and wellbeing of out-of-wedlock children: The significance of the biological parents’ relationship},
year = {2006},
doi = {10.4054/DemRes.2006.15.4},
volume = {15},
number = {4},
pages = {61--104},
}