@article{Kolk2015,
author = {Kolk, M.},
title= {Age Differences in Unions: Continuity and Divergence Among Swedish Couples Between 1932 and 2007},
year = {2015},
doi = {10.1007/s10680-015-9339-z},
journal = {European Journal of Population},
volume = {31},
number = {4},
pages = {365--382},
}