@article{ref1,
title="Asphyxiation and death in oxygen-deficient air",
journal="American journal of public health",
year="1937",
author="Powers, EJ",
volume="27",
number="9",
pages="880-882",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0090-0036",
doi="",
url="http://dx.doi.org/"
}