@article{ref1,
title="Some problems of leisure activity of adolescents",
journal="Zeitschrift fur Arztliche Fortbildung (Jena)",
year="1960",
author="Karsdorf, G.",
volume="54",
number="",
pages="1239-1241",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0044-2178",
doi="",
url="http://dx.doi.org/"
}