@article{ref1,
title="Rationale of mask-mounted hypoxia warning systems",
journal="Aerospace medicine",
year="1967",
author="Ackles, K. N. and Ernsting, J. and Macmillan, A. J.",
volume="38",
number="12",
pages="1244-1247",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-9402",
doi="",
url="http://dx.doi.org/"
}