TY - JOUR A1 - Bengston, V.L. A1 - Roberts, R.E.L. T1 - Intergenerational solidarity in aging families: an example of formal theory construction Y1 - 1991 DO - 10.2307/352993 JF - Journal of Marriage and the Family VL - 53 IS - 4 SP - 856 EP - -870 ER -