@article{Ullmann2011,
author = {Ullmann, S.H. and Goldman, N. and Massey, D.S.},
title= {Healthier before they migrate, less healthy when they return? The health of returned migrants in Mexico},
year = {2011},
doi = {10.1016/j.socscimed.2011.05.037},
volume = {73},
number = {3},
pages = {421--428},
}