@article{Coall2011,
author = {Coall, D.A. and Hertwig, R.},
title= {Grandparental investment: A relic of the past or a resource for the future?},
year = {2011},
doi = {10.1177/0963721411403269},
journal = {Current Directions in Psychological Science },
volume = {20},
number = {2},
pages = {93--98},
}