@article{ref1,
title="Inputs, processes, functions, and systems-let us be clear",
journal="Prehospital and disaster medicine",
year="2011",
author="Birnbaum, Marvin L.",
volume="26",
number="3",
pages="146-147",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="1049-023X",
doi="10.1017/S1049023X1100625X",
url="http://dx.doi.org/10.1017/S1049023X1100625X"
}