1. Proc. 3rd Gov.-Indust. Thermion. Round Table Discus.;Nottingham,1962
2. Proceedings of the Round Table Discussion;Houston,1961
3. Report of the 21st Conference on Physical Electronics;Houston,1961
4. Report of 20th Conference on Physical Electronics;Nottingham,1960
5. Technical Report TEE-7002-5 of the Thermo Electron Engineering Corp., Waltham, Mass.