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Originally presented as the author's Habilitationsschrift--Universiteat Graz, 2000.
Originally presented as the authors' thesis (doctoral)--Universiteat-Gesamthochschule-Siegen, 1992.
Originally presented as the author's thesis (doctoral)--Peadagogische Hochschule Freiburg (Breisgau), 2003.
Originally presented as the author's thesis (doctoral)--Universiteat Regensburg, 1991.
Originally presented as the author's thesis (doctoral)--Keothen, Peadagogische Hochschule, 1993.