1. Results on point-like interactions of high energy photons;Wormser,1983
2. Talk Intern. Europhysics Conf. on High energy physics;Virdee,1983
3. Proc. Intern. Conf. on High energy physics;Fontannaz,1981
4. Proc. CERN Workshop on SPS Fixed-target physics in the years 1984- 1989;Petronzio,1983