@article{McPherson2006,
author = {McPherson, M. and Smith-Lovin, L. and Brashears, M.E.},
title= {Social isolation in America: Changes in discussion networks over two decades},
year = {2006},
doi = {10.1177/000312240607100301},
journal = {American Sociological Review},
volume = {71},
number = {3},
pages = {353--375},
}