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\bibitem{Semenov_etal2004} Semenov, A. D., H{\"u}bers, H. - W., Richter, H., Smirnov, K., Gol{\textquoteright}tsman, G. N., \& Voronov, B. M. (2004). Superconducting hot-electron bolometer mixer for terahertz heterodyne receivers. In \textit{Proc. 15$^{th}$ Int. Symp. Space Terahertz Technol.} (164).

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