@article{ref1,
title="A queuing model for determining system manning and related support requirements. Technical Document Report amrl-tdr-64-21",
journal="Aerospace medical research laboratories technical reports",
year="1964",
author="Barton, H. R. and Purvis, R. E. and Stuart, J. E. and Mallory, W. K.",
volume="",
number="",
pages="1-151",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0192-317X",
doi="",
url="http://dx.doi.org/"
}