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\bibitem{Maslennikova_etal2010} Maslennikova, A., Tretyakov, I., Ryabchun, S., Finkel, M., Kaurova, N., Voronov, B., et al. (2010). Gain bandwidth and noise temperature of NbN HEB mixers with simultaneous phonon and diffusion cooling. In \textit{Proc. 21$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 218--219).

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