@article{ref1,
title="Physiological variables related to the selection of work effort on a treadmill and bicycle",
journal="Research quarterly",
year="1972",
author="Michael, E. and Hackett, P.",
volume="43",
number="2",
pages="216-225",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0034-5377",
doi="",
url="http://dx.doi.org/"
}