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\bibitem{Elmanov_etal2020} Elmanov, I., Sardi, F., Xia, K., Kornher, T., Kovalyuk, V., Prokhodtsov, A., et al. (2020). Development of focusing grating couplers for lithium niobate on insulator platform. In \textit{J. Phys.: Conf. Ser.} (Vol. 1695, 012127).

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