@article{ref1,
title="Letter: Trampoline jumping",
journal="Zeitschrift für Allgemeinmedizin",
year="1975",
author="Volkert, R.",
volume="51",
number="31",
pages="1440-1440",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0300-8673",
doi="",
url="http://dx.doi.org/"
}