@article{Margolis2017a,
author = {Margolis, R. and Wright, L.},
title= {Healthy grandparenthood: How long is it, and how has it changed?},
year = {2017a},
doi = {10.1007/s13524-017-0620-0},
volume = {54},
number = {6},
pages = {2073--2099},
}