@article{ref1,
title="Toxic gases and aviation; gaseous concentrations and altitude",
journal="Archives of industrial hygiene and occupational medicine",
year="1950",
author="Spealman, C. R.",
volume="1",
number="2",
pages="248-253",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0376-1096",
doi="",
url="http://dx.doi.org/"
}