@article{ref1,
title="Use of bicycle helmets by Greensboro children",
journal="North Carolina medical journal",
year="1997",
author="Greer, D. and Fields, K. B.",
volume="58",
number="3",
pages="190-1; discussion 192",
abstract="Abstract unavailable.",
language="",
issn="0029-2559",
doi="",
url="http://dx.doi.org/"
}