Controllability on real reductive Lie groups
In: Mathematische Zeitschrift, Jg. 1992, S. 463-466
A convexity theorem for boundaries of ordered symmetric spaces
In: Canadian journal of mathematics, Jg. 1994, S. 746-757Group theoretical aspects of Gödel's cosmological model
In: Jahrbuch der Gödel Gesellschaft, Jg. 1991, S. 3-11Infinitesimally generated subsemigroups of motion groups
In: Rocky Mountain Journal of Mathematics, Jg. 1991, S. 865-878Invariant Lorentzian orders on simply connected Lie groups
In: Arkiv för Matematik, Jg. 1988, S. 107-115Maximal semigroups and controllability in products of Lie groups
In: Archiv der Mathematik, Jg. 1987, S. 189-195The Mayer-Vietoris and the Puppe sequences in K-theory for C*-Algebras
In: Studia mathematica <Warszawa>, Jg. 1986, S. 97-104A note on Howe's oscillator semigroup
In: Annales de l'Institut Fourier, Jg. 1989, S. 663-688