@article{Lawton1994,
author = {Lawton, L. and Silverstein, M. and Bengtson, V.L.},
title= {Affection, social contact, and geographic distance between adult children and their parents},
year = {1994},
doi = {10.2307/352701},
journal = {Journal of Marriage and the Family},
volume = {56},
number = {1},
pages = {57--68},
}