@article{ref1,
title="Incidence, clinical observations and classification of dental trauma in school children",
journal="Stomatologiia (Sofiia)",
year="1970",
author="Kolimechkova, Z.",
volume="52",
number="1",
pages="1-6",
abstract="<p>[Abstract unavailable]</p><p>Language: bg</p>",
language="bg",
issn="0491-0982",
doi="",
url="http://dx.doi.org/"
}