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\bibitem{Zhang_etal2005} Zhang, W., Jiang, L., Lin, Z. H., Yao, Q. J., Li, J., Shi, S. C., et al. (2005). Development of a quasi-optical NbN superconducting HEB mixer. In \textit{Proc. 16$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 209--213).

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