@article{Ko2013,
author = {Ko, P.C. and Hank, K.},
title= {Grandparents caring for grandchildren in China and Korea: Findings from CHARLS and KLoSA},
year = {2013},
doi = {10.1093/geronb/gbt129},
volume = {69},
number = {4},
pages = {646--651},
}