@article{ref1,
title="Design of motor-cycle crash helmets",
journal="British medical journal: BMJ",
year="1977",
author="Hadfield, G.",
volume="2",
number="6078",
pages="43-43",
abstract="Abstract unavailable.",
language="",
issn="0959-8138",
doi="",
url="http://dx.doi.org/"
}