@article{ref1,
title="The physics of bicycle falls revisited",
journal="Archives of pediatrics and adolescent medicine",
year="1998",
author="Elfenbein, G. J.",
volume="152",
number="4",
pages="411-412",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="1072-4710",
doi="",
url="http://dx.doi.org/"
}