@article{ref1,
title="Air evacuation of head injury patients",
journal="Aerospace medicine",
year="1962",
author="Langdon, D. E.",
volume="33",
number="",
pages="603-608",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0001-9402",
doi="",
url="http://dx.doi.org/"
}