@article{ref1,
title="Flight Safety in VTOL Aircraft",
journal="Annals of the New York Academy of Sciences",
year="1963",
author="Schmidt, C. F.",
volume="107",
number="1",
pages="49-49",
abstract="[Abstract unavailable]  <p>Language: en</p>",
language="en",
issn="0077-8923",
doi="",
url="http://dx.doi.org/"
}