@article{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},
journal = {Journal of Economic Perspectives },
volume = {25},
number = {3},
pages = {173--196},
}