@article{ref1,
title="Classification of sports",
journal="Medicine and science in sports and exercise",
year="1994",
author="Mitchell, J. H. and Haskell, William L. and Raven, P. B.",
volume="26",
number="10 Suppl",
pages="S242-5",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0195-9131",
doi="",
url="http://dx.doi.org/"
}