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\bibitem{Vachtomin_etal2004} Vachtomin, Y. B., Antipov, S. V., Kaurova, N. S., Maslennikov, S. N., Smirnov, K. V., Polyakov, S. L., et al. (2004). Noise temperature, gain bandwidth and local oscillator power of NbN phonon-cooled HEB mixer at terahertz frequenciess. In \textit{Proc. 29th IRMMW / 12th THz} (pp. 329--330). Karlsruhe, Germany.

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