Verbandstheoretische Charakterisierungen von Hilberträumen
(Characterizing Hilbert space by its lattice of subspaces),
Diplomarbeit, Stuttgart (1987)
Untersuchungen über polynomiale Beschränktheit
und einige spektraltheoretische Anwendungen
(Polynomial boundedness and applications to spectral theory),
Dissertation (PhD), Tübingen (1992)
Elements of a spatial theory for non-commutative stationary
processes with discrete time index,
Habilitation Thesis (2002)
A revised version appeared as
Noncommutative Stationary Processes ,
Lecture Notes in Mathematics 1839 ,
Springer-Verlag (2004)
with U.Franz,
Random walks on finite quantum groups ,
Quantum Independent Increment Processes: Quantum Levy Processes,
Classical Probability and Applications, Eds. U. Franz and M. Schürmann,
Lecture Notes in Mathematics 1866 , Springer-Verlag (2005), 1-32