Harmonic generation
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, , , , , , , , and . "Linear and nonlinear optical properties of BiFeO3." Applied Physics Letters 92 (2008).
, , , , , , , , , , , , , , , and . "Harmonic generation in YBaCuO and BiSrCaCuO." Amer.Phys.Soc. 36 (1991) 568.
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