@article{ref1,
title="Perception of traffic guidance signs containing conflicting symbol and direction information",
journal="Ergonomics",
year="1986",
author="Whitaker, L. A. and Sommer, Robert",
volume="29",
number="5",
pages="699-711",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0014-0139",
doi="",
url="http://dx.doi.org/"
}