@article{Bian1998,
author = {Bian, F. and Logan, J.R. and Bian, Y.},
title= {Intergenerational relations in urban China: proximity, contact, and help to parents},
year = {1998},
doi = {10.2307/3004031},
journal = {Demography},
volume = {35},
number = {1},
pages = {115--124},
}