@article{ref1,
title="Mandatory bicycle helmets?",
journal="CMAJ : Canadian Medical Association journal",
year="1993",
author="Rieder, M. J.",
volume="149",
number="11",
pages="1622; author reply 1624-1622; author reply 1624",
abstract="Abstract unavailable.",
language="",
issn="0820-3946",
doi="",
url="http://dx.doi.org/"
}