@article{ref1,
title="Risk factors in severe head injury",
journal="Acta neurochirurgica Supplement",
year="1979",
author="Nau, H. E. and Reinhard, V. and Bongartz, E. B. and Flossdorf, R.",
volume="28",
number="1",
pages="174-178",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0065-1419",
doi="",
url="http://dx.doi.org/"
}