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\bibitem{Semenov_etal2002} Semenov, A. D., H{\"u}bers, H. - W., Richter, H., Birk, M., Krocka, M., Mair, U., et al. (2002). 2.5 THz heterodyne receiver with NbN hot-electron-bolometer mixer. \textit{Phys. C: Supercond.}, \textit{372-376}, 448--453.

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