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\bibitem{XiaolongHu_etal2009} Xiaolong Hu, Holzwarth, C. W., Masciarelli, D., Dauler, E. A., \& Berggren, K. K. (2009). Efficiently coupling light to superconducting nanowire single-photon detectors. \textit{IEEE Trans. Appl. Supercond.}, \textit{19}(3), 336--340.

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