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\bibitem{Maslennikov_etal2006} Maslennikov, S. N., Finkel, M. I., Antipov, S. V., Polyakov, S. L., Zhang, W., Ozhegov, R., et al. (2006). Spiral antenna coupled and directly coupled NbN HEB mixers in the frequency range from 1 to 70 THz. In \textit{Proc. 17$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 177--179). Paris, France.

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