@article{ref1,
title="Amphetamine sulfate and athletic performance. I. Objective effects",
journal="Journal of the American Medical Association",
year="1959",
author="Smith, G. M. and Beecher, H. K.",
volume="170",
number="5",
pages="542-557",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0002-9955",
doi="",
url="http://dx.doi.org/"
}