@article{ref1,
title="Incidence, type and course of injuries in school sports accidents",
journal="Beitrage zur Orthopadie und Traumatologie",
year="1970",
author="Welz, K.",
volume="17",
number="7",
pages="444-453",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0005-8149",
doi="",
url="http://dx.doi.org/"
}