@article{ref1,
title="Voluntary withdrawal from primary flight training as a function of the individual flight instructor",
journal="Aerospace medicine",
year="1966",
author="Pomarolli, R. S. and Ambler, R.",
volume="37",
number="8",
pages="810-812",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-9402",
doi="",
url="http://dx.doi.org/"
}