@article{ref1,
title="Spatial requirements for visual simulation of aircraft at real-world distances",
journal="Human factors",
year="1988",
author="Kennedy, R. S. and Berbaum, K. S. and Collyer, S. C. and May, J. G. and Dunlap, W. P.",
volume="30",
number="2",
pages="153-161",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}