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\bibitem{Jiang_etal2005} Jiang, L., Li, J., Zhang, W., Yao, Q. J., Lin, Z. L., Shi, S. C., et al. (2005). Characterization of NbN HEB mixers cooled by a close-cycled 4 Kelvin refrigerator. \textit{IEEE Trans. Appl. Supercond.}, \textit{15}(2), 511--513.

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