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\bibitem{Huebers_etal2002} H{\"u}bers H-W, Semenov A, Richter H, Birk M, Krocka M, Mair U, et al. Terahertz Heterodyn Receiver with a hot-electron bolometer mixer. In: Wolf U, Farhoomand J, McCreight CR, editors. Far-IR, Sub-mm \& MM Detector Technology Workshop. NASA; 2002. p. 3--24. (NASA CP).

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