@article{ref1,
title="Study options on respiratory protection before permitting confined space entry",
journal="Occupational health and safety",
year="1994",
author="Matranga, B. and Weinstein, S.",
volume="63",
number="5",
pages="64-7, 72",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0362-4064",
doi="",
url="http://dx.doi.org/"
}