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\bibitem{Okunev_etal2008} Okunev, O., Chulkova, G., Milostnaya, I., Antipov, A., Smirnov, K., Morozov, D., et al. (2008). Registration of infrared single photons by a two-channel receiver based on fiber-coupled superconducting single-photon detectors. In I. A. Sukhoivanov, V. A. Svich, \& Y. S. Shmaliy (Eds.), \textit{Proc. SPIE} (Vol. 7009, 70090V (1 to 8)). SPIE.

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