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\bibitem{Finkel_etal2005} Finkel, M. I., Maslennikov, S. N., Vachtomin, Y. B., Svechnikov, S. I., Smirnov, K. V., Seleznev, V. A., et al. (2005). Hot electron bolometer mixer for 20 -- 40 THz frequency range. In \textit{Proc. 16$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 393--397). G{\"o}teborg, Sweden.

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