@article{ref1,
title="A concept of triple tolerance limits based on chronic carbon dioxide toxicity studies",
journal="Aerospace medicine",
year="1961",
author="Schaefer, K. E.",
volume="32",
number="",
pages="197-204",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0001-9402",
doi="",
url="http://dx.doi.org/"
}