@article{ref1,
title="The meaning of color blindness in traffic",
journal="Ophthalmologica",
year="1971",
author="Kalberer, M.",
volume="163",
number="3",
pages="171-177",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0030-3755",
doi="",
url="http://dx.doi.org/"
}