@article{ref1,
title="Play aspects of juvenile riots; objective signs of play",
journal="Zeitschrift für Psychotherapie und medizinische Psychologie",
year="1959",
author="Hartmann, Katia",
volume="9",
number="3",
pages="108-121",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0044-3417",
doi="",
url="http://dx.doi.org/"
}