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\bibitem{Semenov_etal2014} Semenov, A., Richter, H., H{\"u}bers, H. - W., Petrenko, D., Tretyakov, I., Ryabchun, S., et al. (2014). Optimization of the intermediate frequency bandwidth in the THz HEB mixers. In \textit{Proc. 25$^{th}$ Int. Symp. Space Terahertz Technol.} (54).

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