@article{Constant2005,
author = {Constant, A. and Massey, D.S.},
title= {Labor market segmentation and the earnings of German guestworkers},
year = {2005},
doi = {10.1007/s11113-005-4675-z},
journal = {Population Research and Policy Review },
volume = {24},
number = {5},
pages = {489--512},
}