@article{ref1,
title="Crisis as a threat and a development potential--an introduction to classical crisis concepts",
journal="Zeitschrift fur Arztliche Fortbildung (Jena)",
year="1991",
author="Richter, Jorg and Hahn, J.",
volume="85",
number="10",
pages="455-458",
abstract="<p>[Abstract unavailable]</p> <p>Language: de</p>",
language="de",
issn="0044-2178",
doi="",
url="http://dx.doi.org/"
}