@article{ref1,
title="Personal samplers and operators' co-operation: the reality",
journal="Annals of occupational hygiene",
year="1984",
author="Williams, D. J.",
volume="28",
number="4",
pages="439-443",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0003-4878",
doi="",
url="http://dx.doi.org/"
}