@article{ref1,
title="Introduction: the unusualness and contribution of life span longitudinal studies of aggressive and criminal behavior",
journal="Aggressive behavior",
year="2009",
author="Farrington, David P. and Pulkkinen, Lea",
volume="35",
number="2",
pages="115 - 116",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0096-140X",
doi="10.1002/ab.20299",
url="http://dx.doi.org/10.1002/ab.20299"
}