@article{Barro2001,
author = {Barro, R.J. and Lee, J.W.},
title= {International data on educational attainment: Updates and implications},
year = {2001},
doi = {10.1093/oep/53.3.541},
journal = {Oxford Economic Papers},
volume = {53},
number = {3},
pages = {541--563},
}