@article{Walker2011,
author = {Walker, S.P. and Chang, S.M. and Vera-Hernández, M. and Grantham-McGregor, S. },
title= {Early childhood stimulation benefits adult competence and reduces violent behavior},
year = {2011},
doi = {10.1542/peds.2010-2231},
journal = {Pediatrics },
volume = {127},
number = {5},
pages = {849--857},
}