@article{Smits1998,
author = {Smits, J. and Ultee, W. and Lammers, J.},
title= {Educational homogamy in 65 countries: An explanation of differences in openness using country-level explanatory variables},
year = {1998},
doi = {10.2307/2657327},
journal = {American Sociological Review },
volume = {63},
number = {2},
pages = {264--285},
}