@article{Zeng2004,
author = {Zeng, Y. and Vaupel, J.W.},
title= {Association of Late Childbearing with Healthy Longevity among the Oldest-Old in China},
year = {2004},
doi = {10.1080/0032472032000175437},
journal = {Population Studies},
volume = {58},
number = {1},
pages = {37--53},
}