@article{ref1,
title="Performance of drivers with impaired color sense in traffic",
journal="Schweizerische Medizinische Wochenschrift",
year="1971",
author="Zehnder, E.",
volume="101",
number="15",
pages="530-537",
abstract="Abstract unavailable.",
language="",
issn="0036-7672",
doi="",
url="http://dx.doi.org/"
}