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\bibitem{Vakhtomin_etal2003} Vakhtomin, Y. B., Finkel, M. I., Antipov, S. V., Smirnov, K. V., Kaurova, N. S., Drakinskii, V. N., et al. (2003). The gain bandwidth of mixers based on the electron heating effect in an ultrathin NbN film on a Si substrate with a buffer MgO layer. \textit{J. of communications technol. \& electronics}, \textit{48}(6), 671--675.

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