@article{Levin1999,
author = {Levin, J. and Plug, E.},
title= {Instrument education and the returns to schooling in The Netherlands},
year = {1999},
doi = {10.1016/S0927-5371(99)00033-0},
journal = {Labour Economics},
volume = {6},
number = {4},
pages = {521--534},
}