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\bibitem{Gershenzon_etal1987} Gershenzon, E. M., Gol{\textquoteright}tsman, G. N., \& Mirskii, G. I. (1987). Submillimeter backward-wave-tube spectrometer-relaxometer. \textit{Pribory i Tekhnika Eksperimenta}, \textit{30}(4), 131--137.

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