@article{Hank2007,
author = {Hank, K.},
title= {Proximity and contacts between oder parents and their children: A European comparison},
year = {2007},
doi = {10.1111/j.1741-3737.2006.00351.x},
journal = {Journal of Marriage and Family},
volume = {69},
number = {1},
pages = {157--173},
}