@article{ref1,
title="Safe levels of manual forces for young males (3)",
journal="Applied ergonomics",
year="1978",
author="Davis, P. R. and Stubbs, D. A.",
volume="9",
number="1",
pages="33-37",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0003-6870",
doi="",
url="http://dx.doi.org/"
}