@article{ref1,
title="Preferred line of sight angle",
journal="Ergonomics",
year="1986",
author="Kroemer, K. H. and Hill, S. G.",
volume="29",
number="9",
pages="1129-1134",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0014-0139",
doi="",
url="http://dx.doi.org/"
}