@article{ref1,
title="The equation for critical flow of gas through an orifice",
journal="Process safety and environmental protection",
year="2012",
author="Jones, J.C.",
volume="90",
number="1",
pages="76-76",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0957-5820",
doi="10.1016/j.psep.2011.06.016",
url="http://dx.doi.org/10.1016/j.psep.2011.06.016"
}