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- [3] THEORY OF SECOND-HARMONIC GENERATION OF LIGHT IN FOCUSED BEAMS SOVIET PHYSICS JETP-USSR, 1966, 23 (03): : 451 - +
- [4] OPTIMUM FOCUSING OF LIGHT-BEAMS IN PARAMETRIC INTERACTION E=O+O RADIOTEKHNIKA I ELEKTRONIKA, 1974, 19 (02): : 323 - 329