@article{ref1,
title="More on aggression in dogs",
journal="Journal of the American Veterinary Medical Association",
year="1991",
author="Sheffield, M. J.",
volume="198",
number="3",
pages="361-362",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0003-1488",
doi="",
url="http://dx.doi.org/"
}