@article{ref1,
title="Assets and liabilities of helicopter evacuation in support of emergency medical services",
journal="North Carolina medical journal",
year="1976",
author="Proctor, H. J. and Acai, S. A.",
volume="37",
number="1",
pages="25-28",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0029-2559",
doi="",
url="http://dx.doi.org/"
}