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

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