@article{ref1,
title="Head injuries in bicyclists and moped riders in the 5 years before and after the introduction of the compulsory helmet regulation for moped riders",
journal="Nederlands Tijdschrift voor Geneeskunde",
year="1986",
author="Passies, G. and Visser, G. J. and Binnendijk, B.",
volume="130",
number="31",
pages="1398-1401",
abstract="Abstract unavailable.",
language="",
issn="0028-2162",
doi="",
url="http://dx.doi.org/"
}