@article{Constant2003,
author = {Constant, A. and Massey, D.S.},
title= {Self-selection, earnings, and out-migration: A longitudinal study of immigrants to Germany},
year = {2003},
doi = {10.1007/s00148-003-0168-8},
journal = {Journal of Population Economics},
volume = {16},
number = {4},
pages = {631--653},
}