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Genetic and environment influences on social support 

, In: The journals of gerontology / the Gerontological Society of America. James E. Birren, ed.-in-chief
The Swedish adoption/twin study of aging 
Bergeman, C. S. ; Plomin, Robert ; Pedersen, Nancy L... (1990)  3 - p. 101-109
Exemplar:  Zentrale:Magazin Zs fb 2317