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\bibitem{Pentin_etal2011} Pentin IV, Smirnov AV, Ryabchun SA, Gol{\textquoteright}tsman GN, Vaks VL, Pripolzin SI, et al. Heterodyne source of THz range based on semiconductor superlattice multiplier. In: IRMMW-THz.; 2011. p. 1--2.

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