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\bibitem{Zhang_etal2012} Zhang, W., Miao, W., Yao, Q. J., Lin, Z. H., Shi, S. C., Gao, J. R., et al. (2012). Spectral response and noise temperature of a 2.5 THz spiral antenna coupled NbN HEB mixer. \textit{Phys. Procedia}, \textit{36}, 334--337.

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