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4. Arnol’d, V.I., Dopolnitel’nie glavi teorii obiknovenikh differencial’nikh uravnenii (Additional Chapters to the Theory of Ordinary Differential Equations), Moscow: Nauka, 1978.
5. Yariv, A. and Yeh, P., Optic Waves in Crystals, New York: Wiley, 1984.