@article{Van Den Bulte2001,
author = {Van Den Bulte, C. and Lilien, G.},
title= {Medical innovation revisited: Social contagion versus marketing effort},
year = {2001},
doi = {10.1086/320819},
journal = {American Journal of Sociology},
volume = {106},
number = {5},
pages = {1409--1435},
}