@article{ref1,
title="The effects of age and physique on continuous-work capacity",
journal="Human factors",
year="1971",
author="Snook, S. H.",
volume="13",
number="5",
pages="467-479",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}