@article{ref1,
title="Studies on the accident incidence of subjects with defective color perception in traffic",
journal="Klinische Monatsblätter für Augenheilkunde (1963)",
year="1961",
author="Gramberg-Danielsen, B.",
volume="139",
number="",
pages="677-682",
abstract="Abstract unavailable.",
language="",
issn="0023-2165",
doi="",
url="http://dx.doi.org/"
}