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

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