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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 quasi-optical NbN phonon-cooled superconducting HEB mixers. In \textit{Proc. 17$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 55--58).

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