Manfred Droste Leipzig University Institute of Computer Science D-04009 Leipzig, Germany Tel.: +49-341-9732200 Fax: +49-341-9732209 E-Mail: droste@informatik.uni-leipzig.de |
Heiko Vogler Dresden University of Technology Faculty of Computer Science Institute of Theoretical Computer Science D-01062 Dresden, Germany Tel.: +49-351-463-38232 Fax: +49-351-463-37959 E-Mail: vogler@inf.tu-dresden.de |
(July 6, 2005/im)