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\bibitem{Smirnov_etal2015} Smirnov, K., Vachtomin, Y., Divochiy, A., Antipov, A., \& Goltsman, G. (2015). The limitation of noise equivalent power by background radiation for infrared superconducting single photon detectors coupled to standard single mode optical fibers. \textit{Rus. J. Radio Electron.}, (5).

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