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\bibitem{Zubkova_etal2018} Zubkova E, An P, Kovalyuk V, Korneev A, Ferrari S, Pernice W, et al. Optimization of contra-directional coupler based on silicon nitride Bragg rib waveguide. In: J. Phys.: Conf. Ser. Vol 1124.; 2018. 051048.

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