@article{ref1,
title="Physical fitness and mental performance during and after work",
journal="Ergonomics",
year="1980",
author="Sjöberg, H.",
volume="23",
number="10",
pages="977-985",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0014-0139",
doi="10.1080/00140138008924807",
url="http://dx.doi.org/10.1080/00140138008924807"
}