@article{ref1,
title="Physical fitness and tolerances to environmental extremes",
journal="Aerospace medicine",
year="1969",
author="Klein, K. E. and Wegmann, H. M. and Brüner, H. and Vogt, L.",
volume="40",
number="9",
pages="998-1001",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-9402",
doi="",
url="http://dx.doi.org/"
}