@article{ref1,
title="Sport exertion tolerance in childhood and adolescence",
journal="Kinderarztliche praxis",
year="1981",
author="Bringmann, W.",
volume="49",
number="4",
pages="184-192",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0023-1495",
doi="",
url="http://dx.doi.org/"
}