@article{ref1,
title="Ballooning",
journal="Aviation, space, and environmental medicine",
year="1994",
author="Kaufman, W. C.",
volume="65",
number="12",
pages="1161-1162",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0095-6562",
doi="",
url="http://dx.doi.org/"
}