@article{ref1,
title="Protecting the sportsman's brain (concussion in sport). Annual guest lecture 1990, London Sports Medicine Institute",
journal="British journal of sports medicine",
year="1991",
author="Ryan, A. J.",
volume="25",
number="2",
pages="81-86",
abstract="Abstract unavailable.",
language="",
issn="0306-3674",
doi="",
url="http://dx.doi.org/"
}