@article{ref1,
title="Sports suitable for the aging man",
journal="Medizinische Klinik [Urban und Schwarzenberg]",
year="1974",
author="Schmidt, J.",
volume="69",
number="9",
pages="367-371",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0025-8458",
doi="",
url="http://dx.doi.org/"
}