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\bibitem{Vachtomin_etal2004} Vachtomin, Y. B., Antipov, S. V., Maslennikov, S. N., Smirnov, K. V., Polyakov, S. L., Kaurova, N. S., et al. (2004). Noise temperature measurements of NbN phonon-cooled hot electron bolometer mixer at 2.5 and 3.8 THz. In \textit{Proc. 15$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 236--241). Northampton, Massachusetts, USA.

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