@article{Olsen1991,
author = {Olsen, R.B. and Olsen, J. and Gunner-Svensson, F. and Waldstrom, B. },
title= {Social networks and longevity. A 14 year follow-up study among elderly in Denmark},
year = {1991},
doi = {10.1016/0277-9536(91)90235-5},
journal = {Soc Sci Med },
volume = {33},
number = {10},
pages = {1189−1195},
}