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\bibitem{Antipov_etal2017} Antipov S, Trifonov A, Krause S, Meledin D, Desmaris V, Belitsky V, et al. Gain bandwidth of NbN HEB mixers on GaN buffer layer operating at 2 THz local oscillator frequency. In: Proc. 28$^{th}$ Int. Symp. Space Terahertz Technol.; 2017. p. 147--8.

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