@article{ref1,
title="Operational problems of helicopters in the army",
journal="Annals of the New York Academy of Sciences",
year="1963",
author="McCourt, Francis P.",
volume="107",
number="1",
pages="70-77",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0077-8923",
doi="10.1111/j.1749-6632.1963.tb13272.x",
url="http://dx.doi.org/10.1111/j.1749-6632.1963.tb13272.x"
}