@article{ref1,
title="A red-green paradox?",
journal="Human factors",
year="1968",
author="Ekstrom, R. M. and Lavender, H. J.",
volume="10",
number="1",
pages="63-65",
abstract="Abstract unavailable.",
language="",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}