@article{ref1,
title="Investigating complexity factors in UK air traffic management",
journal="Human factors and aerospace safety",
year="2001",
author="Kirwan, Barry and Scaife, R and Kennedy, R.",
volume="1",
number="2",
pages="125-144",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="1468-9456",
doi="",
url="http://dx.doi.org/"
}