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\bibitem{Antipov_etal2019} Antipov, S., Trifonov, A., Krause, S., Meledin, D., Kaurova, N., Rudzinski, M., et al. (2019). Improved bandwidth of a 2 THz hot-electron bolometer heterodyne mixer fabricated on sapphire with a GaN buffer layer. \textit{Supercond. Sci. Technol.}, \textit{32}(7), 075003.

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