@article{Wiik2012,
author = {Wiik, K.A. and Keizer, R. and Lappegård, T.},
title= {Relationship Quality in Marital and Cohabiting Unions Across Europe},
year = {2012},
doi = {10.1111/j.1741-3737.2012.00967.x},
journal = {Journal of Marriage and Family},
volume = {74},
number = {3},
pages = {389--398},
}