@article{ref1,
title="Heat stress--development of a personal warning device",
journal="Annals of occupational hygiene",
year="1977",
author="Lutz, R. and Coker, D. T.",
volume="20",
number="4",
pages="397-405",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0003-4878",
doi="",
url="http://dx.doi.org/"
}