@article{ref1,
title="Physical fitness and skilled work after exercise",
journal="Ergonomics",
year="1968",
author="Hammerton, M. and Tickner, A. H.",
volume="11",
number="1",
pages="41-45",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0014-0139",
doi="",
url="http://dx.doi.org/"
}