@article{ref1,
title="Portable CO2 detectors",
journal="Archives of emergency medicine",
year="1993",
author="Hopper, J. M. and Porter, K. M.",
volume="10",
number="4",
pages="382-382",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0264-4924",
doi="",
url="http://dx.doi.org/"
}