@article{ref1,
title="Hybrid airships : outside the box solutions for the front line",
journal="Defense transportation journal",
year="2010",
author="Schmitt, Karen",
volume="66",
number="3",
pages="18-21",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0011-7625",
doi="",
url="http://dx.doi.org/"
}