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\bibitem{Aksaev_etal1991} Aksaev, E. E., Gershenzon, E. M., Gol{\textquoteright}tsman, G. N., Mirskij, G. I., \& Semenov, A. D. (1991). Submillimetric spectrometer-relaxometer based on backward-wave tubes with picosecond time resolution. \textit{Pribory i Tekhnika Eksperimenta}, \textit{34}(2), 125--131.

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