@article{ref1,
title="Study of U.S. physician-pilot flying habits",
journal="Aerospace medicine",
year="1968",
author="Wick, R. L.",
volume="39",
number="11",
pages="1225-1228",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-9402",
doi="",
url="http://dx.doi.org/"
}