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\bibitem{Tretyakov_etal2008} Tretyakov, I. V., Ryabchun, S. A., Maslennikov, S. N., Finkel, M. I., Kaurova, N. S., Seleznev, V. A., et al. (2008). NbN HEB mixer: fabrication, noise temperature reduction and characterization. In \textit{Proc. Basic problems of superconductivity}. Moscow-Zvenigorod.

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