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\bibitem{Semenov_etal2002} Semenov AD, H{\"u}bers H-W, Richter H, Birk M, Krocka M, Mair U, et al. 2.5 THz heterodyne receiver with NbN hot-electron-bolometer mixer. Phys C: Supercond. 2002;372-376:448--53.

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