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Versicherung Hiermit versichere ich, daß ich die vorliegende Arbeit ohne unzulässsige Hilfe Dritter und ohne Benutzung anderer als der angegebenen Hilfsmittel angefertigt habe; die aus fremden Quellen direkt oder indirekt übernommenen Gedanken sind als solche kenntlich gemacht. Die Arbeit wurde bisher weder im Inland noch im Ausland in gleicher oder ähnlicher Form einer anderen Prüfungsbehörde vorgelegt. Die vorgelegte Dissertation wurde am Institut für Numerische Mathematik der Technischen Universität Dresden unter der wissenschaftlichen Betreuung von Herrn Prof. Dr. rer. nat. habil. H. Schwetlick angefertigt. Dresden, den 2. September 1997 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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