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\bibitem{Tretyakov_etal2008} Tretyakov IV, Ryabchun SA, Maslennikov SN, Finkel MI, Kaurova NS, Seleznev VA, et al. NbN HEB mixer: fabrication, noise temperature reduction and characterization. In: Proc. Basic problems of superconductivity. Moscow-Zvenigorod; 2008.

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