@article{ref1,
title="Leonardo and human flight",
journal="Rivista di medicina aeronautica",
year="1952",
author="Giacomelli, R.",
volume="15",
number="4",
pages="561-84; concl",
abstract="<p>[Abstract unavailable]</p><p>Language: un</p>",
language="un",
issn="0301-6757",
doi="",
url="http://dx.doi.org/"
}