@techreport{Molloy2011,
author = {Molloy, R. and Smith, C.L. and Wozniak, A.K.},
title= {Internal migration in the United States},
year = {2011},
doi = {10.3386/w17307},
publisher = {National Bureau of Economic Research},
address = {Cambridge},
number = {NBER Working Paper 17307},
}