@article{Li2009,
author = {Li, L.W. and Zhang, J. and Liang, J. },
title= {Health among the oldest-old in China: which living arrangements make a difference?},
year = {2009},
doi = {10.1016/j.socscimed.2008.10.013},
journal = {Soc Sci Med },
volume = {68},
number = {2},
pages = {220−227},
}