@article{ref1,
title="1993 annual transport statistics and transport charges survey",
journal="Air Medical Journal",
year="1993",
author="Mayfield, T.",
volume="12",
number="10",
pages="388-390",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="1067-991X",
doi="",
url="http://dx.doi.org/"
}