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\bibitem{Smirnov_etal2018} Smirnov, K., Divochiy, A., Vakhtomin, Y., Morozov, P., Zolotov, P., Antipov, A., et al. (2018). NbN single-photon detectors with saturated dependence of quantum efficiency. \textit{Supercond. Sci. Technol.}, \textit{31}(3), 035011 (1 to 8).

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