@article{ref1,
title="Protective helmets for drivers",
journal="Zentralblatt für Verkehrs-Medizin, Verkehrs-Psychologie und angrenzende ­Gebiete",
year="1957",
author="Ziffer, D.",
volume="2",
number="2",
pages="72-78",
abstract="<p>[Abstract unavailable]</p> <p>Language: de</p> <p>Title translated by <a href=&quot;http://www.LanguageTranslation.com/&quot; target=&quot;blank&quot;>Language Translation, Inc.</a></p><p /> <p>Language: de</p>",
language="de",
issn="",
doi="",
url="http://dx.doi.org/"
}