@article{ref1,
title="A study of traumatized permanent teeth in children 7-15 years. I",
journal="Svensk Tandläkare Tidskrift",
year="1973",
author="Hedegård, B. and Stålhane, I.",
volume="66",
number="5",
pages="431-452",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0039-6745",
doi="",
url="http://dx.doi.org/"
}