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\bibitem{Jiang_etal2006} Jiang, L., Miao, W., Zhang, W., Li, N., Lin, Z. H., Yao, Q. J., et al. (2006). Characterization of a quasi-optical NbN superconducting HEB mixer. \textit{IEEE Trans. Microwave Theory Techn.}, \textit{54}(7), 2944--2948.

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