@article{Schwartz2005,
author = {Schwartz, C.R. and Mare, R.D. },
title= {Trends in educational assortative marriage from 1940 to 2003},
year = {2005},
doi = {10.1353/dem.2005.0036},
journal = {Demography },
volume = {42},
number = {4},
pages = {621--646},
}