@article{ref1,
title="Cycle helmets should not be compulsory",
journal="British medical journal: BMJ",
year="1999",
author="Carnall, D",
volume="318",
number="7197",
pages="1505-1505",
abstract="Abstract unavailable.",
language="",
issn="0959-8138",
doi="",
url="http://dx.doi.org/"
}