1. G. I. Budker. CERN Symposium,1, 68 (1956).
2. V. I. Veksler, CERN Symposium1, 68 (1956).
3. D. W. Kerst, CERN Symposium1, 80 (1956).
4. Ya. B. Fainberg, CERN Symposium1, 36 (1956).
5. Ya. B. Fainberg. Abstracts of the Reports to the All- Union Conference on the Physics of High-Energy Particles,(Akad. Nauk. SSSR, 1956) p. 182.