@article{Hatton2003,
author = {Hatton, T.J. and Williamson, J.G.},
title= {Demographic and economic pressure on emigration out of Africa},
year = {2003},
doi = {10.1111/1467-9442.t01-2-00008},
journal = {The Scandinavian Journal of Economics},
volume = {105},
number = {3},
pages = {465--486},
}