@article{ref1,
title="What is the price for personal freedom?",
journal="Pennsylvania medicine",
year="1990",
author="Smith, J. S.",
volume="93",
number="4",
pages="8-9",
abstract="Commentary on motorcycle helmet legislation.  Abstract unavailable.",
language="",
issn="0031-4595",
doi="",
url="http://dx.doi.org/"
}