1. N. Marcuvitz,Waveguide Handbook(Dover, New York, 1965), Chap. 5, p. 224.
2. R. E. Collin,Foundations for Microwave Engineering(McGraw-Hill, New York, 1966), Chap. 4, pp. 170–179, Chap. 5, p. 218.
3. H. Motz,Electromagnetic Problems of Microwave Theory(Methuen, London, 1951), Chap. 8.
4. Principles of Microwave Circuitsedited by C. G. Montgomery, R. H. Dicke, and E. M. Purcell (McGraw-Hill, New York, 1948), Chap. 5.