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\bibitem{Huebers_etal2002} H{\"u}bers, H. - W., Semenov, A., Richter, H., Birk, M., Krocka, M., Mair, U., et al. (2002). Terahertz heterodyne receiver with a hot-electron bolometer mixer. In J. Wold, \& J. Davidson (Eds.), \textit{Proc. Far-IR, Sub-mm, and mm Detector Technology Workshop}.

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