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\bibitem{Semenov_etal2000} Semenov, A. D., H{\"u}bers, H. {\textendash}W., Schubert, J., Gol{\textquoteright}tsman, G. N., Elantiev, A. I., Voronov, B. M., et al. (2000). Frequency dependent noise temperature of the lattice cooled hot-electron terahertz mixer. In \textit{Proc. 11$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 39--48).

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