@article{ref1,
title="Problems in maintaining scheduled helicopter operations in the New York area",
journal="Annals of the New York Academy of Sciences",
year="1963",
author="Baur, E. N.",
volume="107",
number="1",
pages="92-101",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0077-8923",
doi="10.1111/j.1749-6632.1963.tb13274.x",
url="http://dx.doi.org/10.1111/j.1749-6632.1963.tb13274.x"
}