European Conference on Optics, Optical Systems and Applications.European Conference on Optics, Optical Systems and Applications (1990 : Italy):ECOOSA-Quantum optics : proceedings.IOP,1991.
ed. by D. C. Look & J. S. Blakemore.Conference on Semi-insulating III-V materials (6th : 1990 : Canada):Semi-insulating III-V Materials , toronto 1990.IOP,1990.
E. P. Goldfinch.Radiation protection-theory and practice:Proceedings of the Fourth International Symposium of the Society for Radiological Protection 1989.IOP,1989.