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\bibitem{Pentin_etal2012} Pentin, I. V., Smirnov, A. V., Ryabchun, S. A., Ozhegov, R. V., Gol{\textquoteright}tsman, G. N., Vaks, V. L., et al. (2012). Semiconducting superlattice as a solid-state terahertz local oscillator for NbN hot-electron bolometer mixers. \textit{Tech. Phys.}, \textit{57}(7), 971--974.

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