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\bibitem{Aksaev_etal1991} Aksaev EE, Gershenzon EM, Gol{\textquoteright}tsman GN, Mirskij GI, Semenov AD. Submillimetric spectrometer-relaxometer based on backward-wave tubes with picosecond time resolution. Pribory i Tekhnika Eksperimenta. 1991;34(2):125--31.

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