@article{ref1,
title="Optical orientation during traffic and its examination methods",
journal="Deutsches Medizinisches Journal",
year="1971",
author="Piper, H. F.",
volume="22",
number="22",
pages="701-705",
abstract="Abstract unavailable.",
language="",
issn="0012-1320",
doi="",
url="http://dx.doi.org/"
}