@article{Tong2012,
author = {Tong, Y. and Piotrowski, M.},
title= {Migration and health selectivity in the context of internal migration in China, 1997–2009},
year = {2012},
doi = {10.1007/s11113-012-9240-y},
volume = {31},
number = {4},
pages = {497--543},
}