@article{ref1,
title="Bases of altered physical capacity in sport in middle altitudes",
journal="Hippokrates: Zeitschrift fur praktische Heilkunde",
year="1969",
author="Keul, J. and Doll, E.",
volume="40",
number="23",
pages="897-903",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0018-2001",
doi="",
url="http://dx.doi.org/"
}