1. BEASLEY , J. P. , 1966 ,Proc. 6th Int. Conference on Microwave and Optical Generation and Aplificalion, Cambridge , p. 132 .
2. BECK , A. H. W. , and MAYO , F. , 1960 ,Proc. 3rd Int. Conference on Microwave Tubes, Munich , p. 240 .
3. Millimetre-wave generator working at half the cyclotron resonance frequency
4. BOHM , D. , 1951 ,Quantum Theory( Englewood Cliffs Prentice-Hall ), p. 49 .
5. A powerful source of millimetre wavelength electromagnetic radiation