@article{De Graaf2007,
author = {De Graaf, P.M. and Fokkema, T.},
title= {Contacts between divorced and non-divorced parents and their adult children in the Netherlands: An investment perspective},
year = {2007},
doi = {10.1093/esr/jcl032},
volume = {23},
number = {2},
pages = {263--277},
}