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\bibitem{Maslennikova_etal2010} Maslennikova A, Tretyakov I, Ryabchun S, Finkel M, Kaurova N, Voronov B, et al. Gain bandwidth and noise temperature of NbN HEB mixers with simultaneous phonon and diffusion cooling [abstract]. In: Proc. 21$^{th}$ Int. Symp. Space Terahertz Technol.; 2010. p. 218--9.

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