@article{ref1,
title="Flying in balloons, blimps, gliders, and kites",
journal="Statistical Bulletin (Met. Life)",
year="1975",
author="",
volume="56",
number="",
pages="5-7",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0026-1513",
doi="",
url="http://dx.doi.org/"
}