@article{ref1,
title="The organisation of leisure for children (author's transl)",
journal="Offentliche Gesundheitswesen",
year="1974",
author="Grassl, E.",
volume="36",
number="3",
pages="180-186",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0029-8573",
doi="",
url="http://dx.doi.org/"
}