TY - JOUR A1 - Aarskaug Wiik, K. A1 - Keizer, R. A1 - LappegÄrd, T. T1 - Relationship quality in marital and cohabiting unions across Europe Y1 - 2012 DO - 10.1111/j.1741-3737.2012.00967.x VL - 74 IS - 3 ER -