Also published on the institutional repository of the University of Kassel KOBRA (https://nbn-resolving.org/urn:nbn:de:hebis:34-2006061913471 | https://kobra.uni-kassel.de/handle/123456789/2006061913471)
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Other version: for a text version (without illustrations) of this article see (KOBRA - institutional repository of the University of Kassel): https://nbn-resolving.org/urn:nbn:de:hebis:34-2006053112651