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\bibitem{Zubkova_etal2019} Zubkova, E., Golikov, A., An, P., Kovalyuk, V., Korneev, A., Ferrari, S., et al. (2019). CWDM demultiplexer using anti-reflection, contra-directional couplers based on silicon nitride rib waveguide. In \textit{J. Phys.: Conf. Ser.} (Vol. 1410, 012179).

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