@article{ref1,
title="Knowledge about aggression theory as an aid in hospital nursing",
journal="Deutsche Krankenpflegezeitschrift",
year="1990",
author="Maier-Opitz, M.",
volume="43",
number="1",
pages="suppl 1-8",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0012-074X",
doi="",
url="http://dx.doi.org/"
}