@article{Geurts2009,
author = {Geurts, T. and Poortman, A.-R. and van Tilburg, T. and Dykstra, P.A.},
title= {Contact between Grandchildren and Their Grandparents in Early Adulthood},
year = {2009},
doi = {10.1177/0192513X09336340},
journal = {Journal of Family Issues},
volume = {30},
pages = {1698--1713},
}