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\bibitem{Tretyakov_etal2015} Tretyakov, I., Maslennikov, S., Semenov, A., Safir, O., Finkel, M., Ryabchun, S., et al. (2015). Impact of operating conditions on noise and gain bandwidth of NbN HEB mixers. In \textit{Proc. 26$^{th}$ Int. Symp. Space Terahertz Technol.} (39).

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