@article{Cacioppo2009,
author = {Cacioppo, J.T. and Fowler, J.H. and Christakis, N.A.},
title= {Alone in the Crowd: The Structure and Spread of Loneliness in a Large Social Network},
year = {2009},
doi = {10.1037/a0016076},
journal = {Journal of Personality and Social Psychology},
volume = {97},
number = {6},
pages = {977--991},
}