@article{ref1,
title="Mouth protection instruments for boxers and ice hockey players, their purpose and practical construction",
journal="Deutsche Gesundheitswesen",
year="1958",
author="Raabe, K.",
volume="13",
number="18",
pages="572-575",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0012-0219",
doi="",
url="http://dx.doi.org/"
}