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1. J.A.Giordmain, R.C.Miller, Tunable coherent parametric oscillation in LiNbO3 at optical frequencies, Phys. Rev. Letters 14, 973-976 (1965),
2. S.A.Akhmanov, A.I.Kovrigin, A.S.Piskarskas, V.V.Fadeev, R.V.Khokhlov, Observation of parametric amplification in the optical range, JETP Letters 2, No.7, 191-193 (1965)n q
==External links==
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