@article{ref1,
title="Dual versus solo pilot navigation in helicopters at low level",
journal="Ergonomics",
year="1968",
author="Lewis, R. E. and De la Riviere, W. D. and Sweeney, D. M.",
volume="11",
number="2",
pages="145-155",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0014-0139",
doi="",
url="http://dx.doi.org/"
}