[1] M. Cronin-Golomb, B. Fischer, J. O. White et al.. Theory and applications of four-wave mixing in photorefractive media. IEEE J. Quant. Electron., 1984, QE-20(1): 12~30
[3] P. M. Petersen, P. M. Johansen. Simple theory for degenerate four-wave mixing in photorefeactive media. Opt. Lett., 1988, 13(1): 45~46
[4] J. Golts, T. Tschudi. Four-wave mixing in photorefractive crystals with depleted pumps: an analytical treatment. Opt. Lett., 1989, 14(8): 405~407