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\bibitem{Pentin_etal2011} Pentin, I. V., Smirnov, A. V., Ryabchun, S. A., Gol{\textquoteright}tsman, G. N., Vaks, V. L., Pripolzin, S. I., et al. (2011). Heterodyne source of THz range based on semiconductor superlattice multiplier. In \textit{IRMMW-THz} (pp. 1--2).

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