- 11th International Conference on Elastic and Diffractive Scattering - Towards High Energy Frontiers, Château de Blois, France, 15-20 May 2005, in collaboration with M. Haguenauer and J. Tran Thanh Van.
- International Workshop "Time in Sciences", Institut Français de Bucharest, Romania, 28-30 June 1993, organized in collaboration with Norbert Dodille, Director of Institut Français de Bucarest and Christian Duhamel, Scientific Cooperation Director at the French Embassy in Romania. The Proceedings were published in 1995 Harmattan Editions, Paris, France.
- National Meeting of Particle Physics, Institute of Nuclear Physics, Orsay, France, 24-25 novembre 1992.
- 1st Workshop on Elastic and Diffractive Scattering at the Collider and Beyond, Château de Blois, France, 3-6 June 1985, organized in collaboration with J. Tran Thanh Van.
- Workshop on Baryonium and Other Unusual Hadron States, Institute of Nuclear Physics, Orsay, France, 21-22 June 1979, in collaboration with J.-M. Richard and R. Vinh Mau.
- National Meeting of Phenomenology of Particle Physics, Paris, France, 13-14 May 1976.