@article{Sampson1997,
author = {Sampson, R.J. and Raudenbush, S.W. and Earls, F.},
title= {Neighborhoods and violent crime: A multilevel study of collective efficacy},
year = {1997},
doi = {10.1126/science.277.5328.918},
journal = {Science},
volume = {277},
number = {5328},
pages = {918--924},
}