@article{ref1,
title="Variations in ATC-work load as a function of variations in cockpit workload",
journal="Ergonomics",
year="1971",
author="Krol, J. P.",
volume="14",
number="5",
pages="585-590",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0014-0139",
doi="",
url="http://dx.doi.org/"
}