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\bibitem{Semenov_etal2006} Semenov, A., Il{\textquoteright}yin, K., Siegel, M., Smirnov, A., Pavlov, S., Richter, H., et al. (2006). Intermediate frequency bandwidth of a hot-electron mixer: Comparision with bolometric models. In \textit{Proc. 17$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 73--76). Paris, France.

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