References
- Kock, W. E., Bell Sys. Tech. J. 27, (1948), 58.
- Kock, W. E. & Harvey, F. K., J. Acous. Soc. Amer., 21 (1949), 471.
- Morse & Feshbach, Methods of Theoretical Physics, Part II, International series in pure and applied physics (McGraw-Hill Book Co.) 1953, p. 1424.
- Brown, J., Microwave Lenses, Methuen's monographs (Methuen & Co. Ltd.), 1953, p. 46.