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H.J. Bakker, P.C.M. Planken and H.G. Muller, Numerical calculation of optical frequency-conversion processes: a new approach, J. Opt. Soc. Am. B 6, 1665-1672 (1989)
H.J. Bakker, P.C.M. Planken, L.K. Kuipers and A. Lagendijk, Simultaneous phase matching of three second-order nonlinear optical processes in LiNbO3, Opt. Commun. 73, 398-402 (1989)
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