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\bibitem{Vachtomin_etal2004} Vachtomin YB, Antipov SV, Maslennikov SN, Smirnov KV, Polyakov SL, Kaurova NS, et al. Noise temperature measurements of NbN phonon-cooled hot electron bolometer mixer at 2.5 and 3.8 THz. In: Proc. 15$^{th}$ Int. Symp. Space Terahertz Technol. Northampton, Massachusetts, USA; 2004. p. 236--41.

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