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2. A. Yariv: Introduction to Optical Electronics, 2nd edn. (Holt, Rinehart and Winston, New York 1976) p. 364
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4. M. Barnoski: Introduction to Integrated Optics (Plenunm, New York 1974) p.61
5. D. Mergerian, E. Malarkey: Microwave J. 23, 37 (1980)