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\bibitem{Finkel_etal2003} Finkel M, Vachtomin Y, Antipov S, Drakinski V, Kaurova N, Voronov B, et al. Gain bandwidth and noise temperature of NbTiN HEB mixer. In: Proc. 14$^{th}$ Int. Symp. Space Terahertz Technol.; 2003. p. 276--85.

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