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\bibitem{Gousev_etal1998} Gousev, Y. P., Olsson, H. K., Gol{\textquoteright}tsman, G. N., Voronov, B. M., \& Gershenzon, E. M. (1998). NbN hot-electron mixer at radiation frequencies between 0.9 THz and 1.2 THz. In \textit{Proc. 9$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 121--129).

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