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\bibitem{Smirnov_etal2008} Smirnov, K. V., Vachtomin, Y. B., Ozhegov, R. V., Pentin, I. V., Slivinskaya, E. V., Korneev, A. A., et al. (2008). Fiber coupled single photon receivers based on superconducting detectors for quantum communications and quantum cryptography. In P. Tom{\'a}nek, D. Sender{\'a}kov{\'a}, \& M. Hrabovsk{\'y} (Eds.), \textit{Proc. SPIE} (Vol. 7138, 713827 (1 to 6)). Spie.

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