@article{ref1,
title="Motorcycle helmet visibility and retro-reflectorization",
journal="American journal of optometry and archives of American Academy of Optometry",
year="1969",
author="Hazlett, R. D. and Courtney, G. R. and Stockley, L. A. and Allen, Merrill J.",
volume="46",
number="9",
pages="666-675",
abstract="Abstract unavailable.",
language="",
issn="0002-9408",
doi="",
url="http://dx.doi.org/"
}