@article{ref1,
title="Predicition of flight training attrition by grade slips for first ten flights",
journal="Journal of aviation medicine",
year="1958",
author="Trites, D. K. and Cobb, B. B. and Brown, W. F.",
volume="29",
number="11",
pages="827-831",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0095-991X",
doi="",
url="http://dx.doi.org/"
}