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\bibitem{Semenov_etal2000} Semenov AD, H{\"u}bers H{\textendash}W, Schubert J, Gol{\textquoteright}tsman GN, Elantiev AI, Voronov BM, et al. Frequency dependent noise temperature of the lattice cooled hot-electron terahertz mixer. In: Proc. 11$^{th}$ Int. Symp. Space Terahertz Technol.; 2000. p. 39--48.

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