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\bibitem{Finkel_etal2003} Finkel, M., Vachtomin, Y., Antipov, S., Drakinski, V., Kaurova, N., Voronov, B., et al. (2003). Gain bandwidth and noise temperature of NbTiN HEB mixer. In \textit{Proc. 14$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 276--285).

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