@article{ref1,
title="Prevalence and distribution of traumatic injuries to the teeth of Copenhagen school children 1967-68",
journal="Tandlaegebladet",
year="1969",
author="Ravn, J. J. and Rossen, I.",
volume="73",
number="1",
pages="1-9",
abstract="<p>[Abstract unavailable]</p><p>Language: da</p>",
language="da",
issn="0039-9353",
doi="",
url="http://dx.doi.org/"
}