@article{ref1,
title="Positive with private support for bicycle helmets",
journal="Sygeplejersken",
year="1990",
author="Martsum, A. M.",
volume="90",
number="38",
pages="17-17",
abstract="Abstract unavailable.",
language="",
issn="0106-8350",
doi="",
url="http://dx.doi.org/"
}