@article{ref1,
title="Assessment of Smoke Density with a Helium-Neon Laser",
journal="Fire and materials",
year="1985",
author="Clark, FRS",
volume="9",
number="1",
pages="30-35",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0308-0501",
doi="",
url="http://dx.doi.org/"
}