@article{ref1,
title="Head injury, a clinical perspective",
journal="Aerospace medicine",
year="1968",
author="Welch, L. K.",
volume="39",
number="11",
pages="1231-1235",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-9402",
doi="",
url="http://dx.doi.org/"
}