@article{ref1,
title="Aggressive violence, an increasing problem",
journal="Modern veterinary practice",
year="1977",
author="Campbell, W. E.",
volume="58",
number="5",
pages="461, 463-464",
abstract="<p>[Abstract unavailable]</p>",
language="en",
issn="0362-8140",
doi="",
url="http://dx.doi.org/"
}