@article{ref1,
title="Dental trauma in children and adolescents",
journal="Clinical pediatrics",
year="1980",
author="Berkowitz, R. and Ludwig, S. and Johnson, R.",
volume="19",
number="3",
pages="166-171",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0009-9228",
doi="",
url="http://dx.doi.org/"
}