@article{ref1,
title="Depression--darkness and emptiness in the midst of existence",
journal="Zeitschrift fuer Krankenpflege",
year="1968",
author="Kielholz, P. and Hole, G.",
volume="61",
number="11",
pages="438-442",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0044-2941",
doi="",
url="http://dx.doi.org/"
}