@article{ref1,
title="Surface colouration, lettering and referential dimension of traffic marker perception",
journal="Perceptual and motor skills",
year="1972",
author="Nelson, Thomas M. and Ladan, C. J.",
volume="35",
number="3",
pages="867-873",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0031-5125",
doi="",
url="http://dx.doi.org/"
}