- 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
- Particles and Fields - Proceedings of the First German-Polish Symposium
- Classical and Quantum Systems: Foundations and Symmetries - Proceedings of the 2nd International Wigner Symposium
- Quantum Symmetries - Proceedings of the International Workshop on Mathematical Physics
- Lie Theory and Its Applications in Physics - Proceedings of an International Workshop






