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2. D.MARCUSE, Theory of Dielectric Optical Waveguides, 2nd edn (Academic Press, San Diego, 1991).
3. C.VASSALLO, Optical Waveguide Concepts (Elsevier Science, Amsterdam, 1991).
4. W. C.CHEW, Waves and Fields in Inhomogeneous Media (Van Nostrand & Reinhold, New York, 1990).
5. A. W.SNYDER and J. D.LOVE, Optical Waveguide Theory (Chapman & Hall, London, 1983).