@article{ref1,
title="Self-inflicted periodontal injury",
journal="British dental journal",
year="1979",
author="Groves, B. J.",
volume="147",
number="9",
pages="244-246",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0007-0610",
doi="",
url="http://dx.doi.org/"
}