@article{Yi2002,
author = {Yi, Z. and Vaupel, J.W. and Zhenyu, X. and Chunyuan, Z. and Yuzhi, L.},
title= {Sociodemographic and health profiles of the oldest old in China},
year = {2002},
doi = {10.1111/j.1728-4457.2002.00251.x},
journal = {Population and Development Review},
volume = {28},
number = {2},
pages = {251‒273},
}