@article{ref1,
title="Maximum voluntary strengths of male adults in some lifting, pushing and pulling activities",
journal="Ergonomics",
year="1980",
author="Warwick, D. and Novak, G. and Schultz, A. and Berkson, M.",
volume="23",
number="1",
pages="49-54",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0014-0139",
doi="",
url="http://dx.doi.org/"
}