@article{ref1,
title="Injuries in youth football",
journal="Journal of safety research",
year="1989",
author="Nicholas, J. A. and Robertson, Leon S. and Rosenthal, P. P. and Goldberg, B.",
volume="20",
number="1",
pages="44-45",
abstract="<p>[Abstract unavailable]  Keywords: American football; Soccer</p>",
language="en",
issn="0022-4375",
doi="",
url="http://dx.doi.org/"
}