TY - JOUR A1 - Smits, J. A1 - Ultee, W. A1 - Lammers, J. T1 - Educational Homogamy in 65 Countries: An explanation of differences in openness using country-level explanatory variables Y1 - 1998 DO - 10.2307/2657327 JF - American Sociological Review VL - 63 ER -