@article{Ham2011,
author = {Ham, J.C. and Li, X. and Reagan, P.B.},
title= {Matching and semi-parametric IV estimation, a distance-based measure of migration, and the wages of young men},
year = {2011},
doi = {10.1016/j.jeconom.2010.12.004},
volume = {161},
number = {2},
pages = {208--227},
}