@article{Seeman1987,
author = {Seeman, T.E. and Kaplan, G.A. and Knudsen, L. and Cohen, R. and Guralnik, J. },
title= {Social network ties and mortality among the elderly in the Alameda County Study},
year = {1987},
journal = {Am J Epidemiol},
volume = {126},
number = {4},
pages = {714−723},
}