@article{ref1,
title="Oxygen sources for space flights",
journal="Aerospace medicine",
year="1960",
author="Bovard, R. M.",
volume="31",
number="",
pages="407-412",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-9402",
doi="",
url="http://dx.doi.org/"
}