@article{ref1,
title="Performance efficiency of men breathing oxygen-helium at depths between 100 feet and 1500 feet",
journal="Aerospace medicine",
year="1971",
author="Bennett, P. B. and Towse, E. J.",
volume="42",
number="11",
pages="1147-1156",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-9402",
doi="",
url="http://dx.doi.org/"
}