@article{ref1,
title="Some considerations of direct-lift V/STOL aircraft",
journal="Annals of the New York Academy of Sciences",
year="1963",
author="Katzenberger, E. F. and Ulisnik, H. D. and Adler, A.",
volume="107",
number="1",
pages="380-408",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0077-8923",
doi="10.1111/j.1749-6632.1963.tb13288.x",
url="http://dx.doi.org/10.1111/j.1749-6632.1963.tb13288.x"
}