@article{ref1,
title="Blunt trauma involving the colon and rectum",
journal="Journal of trauma",
year="1976",
author="Howell, H. S. and Bartizal, J. F. and Freeark, R. J.",
volume="16",
number="08",
pages="624-632",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0022-5282",
doi="",
url="http://dx.doi.org/"
}