TY  - JOUR
A1  - Greenwell, L.
A1  - Bengtson, V.L.
T1  - Geographic distance and contact between middle-aged children and their parents: The effects of social class over 20 years
Y1  - 1997
DO  - 10.1093/geronb/52B.1.S13
VL  - 52
IS  - 1

ER  -