@article{Cohen2008,
author = {Cohen, J.E. and Roig, M. and Reuman, D.C. and GoGwilt, C.},
title= {International migration beyond gravity: A statistical model for use in population projections},
year = {2008},
doi = {10.1073/pnas.0808185105 },
journal = {Proceedings of the National Academy of Sciences },
volume = {105},
number = {40},
pages = {15269--15274},
}