@article{ref1,
title="Causes of in-facepiece sampling bias--I. Half-facepiece respirators",
journal="Annals of occupational hygiene",
year="1988",
author="Myers, W. R. and Allender, J. R. and Iskander, W. and Stanley, C.",
volume="32",
number="3",
pages="345-359",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0003-4878",
doi="",
url="http://dx.doi.org/"
}