@article{Barro2013,
author = {Barro, R.J.  and Lee, J.W.},
title= {A new data set of educational attainment in the world, 1950–2010},
year = {2013},
doi = {10.1016/j.jdeveco.2012.10.001},
journal = {Journal of Development Economics},
volume = {104},
pages = {184--198},
}