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I would like to thank Prof. Dr. J. Eickel, who made this work possible. I gratefully acknowledge many fruitful discussions with Riitta Höllerer during the development of this project. I would especially like to thank Anton Hartl, Markus Stumpf, Elmar Bartel and my brother Markus, who assisted me at any time with their suggestions, hints and advices and thus(More)
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