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\bibitem{Sobolewski_etal2002} Sobolewski, R., Xu, Y., Zheng, X., Williams, C., Zhang, J., Verevkin, A., et al. (2002). Spectral sensitivity of the NbN single-photon superconducting detector. \textit{IEICE Trans. Electron.}, \textit{E85-C}(3), 797--802.

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