@article{ref1,
title="The occurrence of athletic injuries in various kind of sports",
journal="Hefte zur Unfallheilkunde",
year="1967",
author="Arens, W.",
volume="91",
number="",
pages="175-179",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0085-1469",
doi="",
url="http://dx.doi.org/"
}