@article{ref1,
title="Combined effects of altitude and high temperature on complex performance",
journal="Human factors",
year="1972",
author="Higgins, E. A. and Iampietro, P. F. and Chiles, W. D.",
volume="14",
number="2",
pages="161-172",
abstract="Abstract unavailable.",
language="",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}