Twistor Geometry and Non-Linear Systems: Review Lectures Given at the 4th Bulgarian Summer School on Mathematical Problems of Quantum Field Theory, Held at Primorsko, Bulgaria, September 1980

Quantum Groups: Proceedings of the 8th International Workshop on Mathematical Physics, Held at the Arnold Sommerfeld Institute, Clausthal, Frg, on 19-26 July 1989

Differential Geometric Methods in Mathematical Physics: Proceedings of the International Conference Held at the Technical University of Clausthal, Germany, July 1978

Symmetries in Science V: Algebraic Systems, Their Representations, Realizations, and Physical Applications

Differential Geometric Methods in Mathematical Physics: Proceedings of an International Conference Held at the Technical University of Clausthal, Frg, August 30 - September 2, 1983

Differential Geometric Methods in Mathematical Physics: Proceedings of an International Conference Held at the Technical University of Clausthal, Frg, August 30 - September 2, 1983

Quantum Groups: Proceedings of the 8th International Workshop on Mathematical Physics, Held at the Arnold Sommerfeld Institute, Clausthal, Frg, on 19-26 July 1989