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\bibitem{Semenov_etal2003} Semenov, A. D., Hiibers, H. - W., Richter, H., Smirnov, K., Gol{\textquoteright}tsman, G. N., Kaurova, N., et al. (2003). Superconducting hot-electron bolometer mixer for terahertz heterodyne receivers. In \textit{Proc. 14$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 33--40).

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