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2. Y.R. Shen: Prog. Quant. Electron. 4, 1 (1975)
3. J.H. Marburger: Prog. Quant. Electron. 4, 35 (1975)
4. Y.R. Shen: The Principles of Nonlinear Optics (Wiley, New York 1984)
5. J.F. Reintges: Nonlinear Optical Parametric Processes in Liquids and Gases (Academic, Orlando 1984)