@article{ref1,
title="Doctrine of the professional aptitude of aviators",
journal="Rivista di medicina aeronautica",
year="1950",
author="Marulli, A.",
volume="13",
number="1",
pages="3-17",
abstract="<p>[Abstract unavailable]</p><p>Language: un</p>",
language="un",
issn="0301-6757",
doi="",
url="http://dx.doi.org/"
}