@article{ref1,
title="Visual orientation in automobile traffic and its examination methods",
journal="Medizinische Klinik [Urban und Schwarzenberg]",
year="1969",
author="Piper, H. F.",
volume="64",
number="23",
pages="1092-1098",
abstract="Abstract unavailable.",
language="",
issn="0025-8458",
doi="",
url="http://dx.doi.org/"
}