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Accepted by the Faculty of Science of the University of (2011)

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by Universität Fribourg , Mathematisch-naturwissenschaftliche Fakultät , Florian Verdet , M. Pietro , Laface Professor , Politecnico Di Turino , M. Jean , Hennebert Lecturer , Université De Fribourg , Fribourg Supervisor , Mrs Régine André-obrecht , M. Pietro Laface , Mrs Lori Lamel , M. Rolf Ingold