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Originally presented as the author's thesis (doctoral)--UniversiteatFrankfurt (Main), 2005.
Originally presented as the author's thesis (doctoral)--Universiteat Frankfurt (Main), 1999.
Originally presented as the author's thesis (doctoral)--Ruhr-Universiteat Bochum, 2003.
Originally presented as the author's thesis (doctoral)--Universiteat Rostock, 2006.
Originally presented as the author's thesis (doctoral)--Universiteat Trier, 2007.