@article{ref1,
title="Self-inflicted gingival injuries. Gingivitis artefacta, factitial gingivitis",
journal="Dental practitioner and dental record",
year="1972",
author="Stewart, D. J. and Kernohan, D. C.",
volume="22",
number="11",
pages="418-426",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0011-8729",
doi="",
url="http://dx.doi.org/"
}