@article{ref1,
title="Play behavior interpreted as aggression or hyperactivity: case histories",
journal="Modern veterinary practice",
year="1980",
author="Voith, V. L.",
volume="61",
number="8",
pages="707-709",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0362-8140",
doi="",
url="http://dx.doi.org/"
}