@article{Aral2009,
author = {Aral, S. and Muchnik, L. and Sundararajan, A.},
title= {Distinguishing influence-based contagion from homophily-driven diffusion in dynamic networks},
year = {2009},
doi = {10.1073/pnas.0908800106},
volume = {106},
number = {51},
pages = {21544--21549},
}