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\bibitem{Verevkin_etal2002} Verevkin, A. A., Zhang, J., Slysz, W., Sobolewski, R., Lipatov, A. P., Okunev, O., et al. (2002). Superconducting single-photon detectors for GHz-rate free-space quantum communications. In J. C. Ricklin, \& D. G. Voelz (Eds.), \textit{Proc. SPIE} (Vol. 4821, pp. 447--454). SPIE.

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