@article{ref1,
title="Effect of oxygen on night vision",
journal="Aerospace medicine",
year="1970",
author="Pretorius, H. A.",
volume="41",
number="5",
pages="560-562",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-9402",
doi="",
url="http://dx.doi.org/"
}