@article{ref1,
title="Ski injuries of the knee joint",
journal="Praxis (Hallwag)",
year="1969",
author="Stahel, P.",
volume="58",
number="4",
pages="109-117",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0369-8394",
doi="",
url="http://dx.doi.org/"
}