@article{ref1,
title="Minor head injury: 13 is an unlucky number",
journal="Journal of trauma",
year="2001",
author="Stein, Sherman C.",
volume="50",
number="4",
pages="759-760",
abstract="Abstract unavailable.",
language="",
issn="0022-5282",
doi="",
url="http://dx.doi.org/"
}