@article{ref1,
title="Effect of amphetamine sulfate on athletic performance",
journal="Journal of the American Medical Association",
year="1959",
author="Karpovich, P. V.",
volume="170",
number="5",
pages="558-561",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0002-9955",
doi="",
url="http://dx.doi.org/"
}