ULTRA-HIGH-FREQUENCY OSCILLATIONS 291 



References 



1. W. E. Benhani, "Theory of the Internal Action of Thermionic Systems at Moder- 



ately High Frequencies," Phil. Mag., March 1928 and Phil. Mag. Supplement, 

 Vol. 11, February 1931. 



2. Miiller, "Experimentelle Untersuchungen uber Elektronen-Schwingungen," Iloch. 



u. Elek., Vol. 43, No. 6, June 1934. 



3. W. W. Hansen, "On the Resonant Frequency of Closed Concentric Lines," Jour. 



App. Phys., Vol. 10, No. 1, January 1939. 



4. F. B. Llewellyn, "Operation of Ultra-High-Frequency Vacuum Tubes," Bell 



System Technical Journal, Vol. 14, No. 4, October 1935. 



5. S. A. Schelkunoff, "Some Equivalence Theorems of Electromagnetics and Their 



Application to Radiation Problems," Bell System Technical Journal, Vol. 15, 

 No. 1, January 1936. 



6. G. C. Southworth, "Hyper-Frequency Wave Guides — General Considerations and 



Experimental Results," Bell System Technical Journal, Vol. 15, No. 2, April 

 1936. 



