@article{ref1,
title="Collective violence: whose responsibility?",
journal="Promotion and education",
year="2003",
author="Green, J.",
volume="10",
number="2",
pages="56-7, 79",
abstract="<p>[Abstract unavailable]</p> <p>Language: es</p>",
language="es",
issn="1025-3823",
doi="",
url="http://dx.doi.org/"
}