Søgning på underkategorier- og emner:
Originally presented as the authors' thesis (doctoral)--Universiteat-Gesamthochschule-Siegen, 1992.
Originally presented as the author's thesis (doctoral)--Universiteat Regensburg, 1991.
Revised thesis (master's)--Universiteat Helsinki, 2000.
Originally presented as the author's thesis (doctoral)--Universiteat Dortmund, 2005.