@article{ref1,
title="Brain trauma and the postconcussional syndrome",
journal="Lancet",
year="1971",
author="Kay, D. W. and Kerr, T. A. and Lassman, L. P.",
volume="2",
number="7733",
pages="1052-1055",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0140-6736",
doi="",
url="http://dx.doi.org/"
}