@article{ref1,
title="The nature and extent of speed use in North America",
journal="Canadian Medical Association journal",
year="1970",
author="Cox, C. and Smart, Reginald G.",
volume="102",
number="7",
pages="724-729",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0008-4409",
doi="",
url="http://dx.doi.org/"
}