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4. B. I. Stepanov (editor), Methods for Designing Lasers [in Russian], Vol. 2, Nauka i Tekhnika, Minsk (1968), p. 270.
5. A. L. Mikaelyan, M. L. Ter-Mikaelyan, and Yu. G. Turkov, Solid-State Optical Generators [in Russian], Sovet-skoe Radio, Moscow (1967), p. 303.