@article{ref1,
title="History of emergency medical services in the United States",
journal="Journal of trauma",
year="1976",
author="Rockwood, C. A. and Mann, C. M. and Farrington, J. D. and Hampton, O. P. and Motley, R. E.",
volume="16",
number="4",
pages="299-308",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0022-5282",
doi="",
url="http://dx.doi.org/"
}