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\bibitem{Seliverstov_etal2017} Seliverstov, S. V., Anfertyev, V. A., Tretyakov, I. V., Ozheredov, I. A., Solyankin, P. M., Revin, L. S., et al. (2017). Terahertz heterodyne receiver with an electron-heating mixer and a heterodyne based on the quantum-cascade laser. \textit{Radiophys. Quant. Electron.}, \textit{60}(7), 518--524.

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