@article{Smits1999,
author = {Smits, J. and Ultee, W. and Lammers, J.},
title= {Occupational homogamy in eight countries of the European Union, 1975–89},
year = {1999},
doi = {10.1177/000169939904200104},
volume = {42},
number = {1},
pages = {55--68},
}