@article{ref1,
title="Problems of students with prolonged studies",
journal="Psyche (E Klett)",
year="1969",
author="Ziolko, H. U.",
volume="23",
number="10",
pages="748-753",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0033-2623",
doi="",
url="http://dx.doi.org/"
}