@article{ref1,
title="Psychological requirements of the airplane pilot",
journal="Journal of aviation medicine",
year="1947",
author="Flanagan, J. C.",
volume="18",
number="6",
pages="521-527",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0095-991X",
doi="",
url="http://dx.doi.org/"
}