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\bibitem{Ryabchun_etal2009} Ryabchun, S. A., Tretyakov, I. V., Pentin, I. V., Kaurova, N. S., Seleznev, V. A., Voronov, B. M., et al. (2009). Low-noise wide-band hot-electron bolometer mixer based on an NbN film. \textit{Radiophys. Quant. Electron.}, \textit{52}(8), 576--582.

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