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\bibitem{Huebers_etal2003} Huebers H-W, Semenov A, Richter H, Birk M, Krocka M, Mair U, et al. Superconducting hot electron bolometer as mixer for far-infrared heterodyne receivers. In: Phillips TG, Zmuidzinas J, editors. Proc. SPIE. Vol 4855. Tucson, USA: SPIE; 2003. p. 395--401. (Presented at the Society of Photo-Optical Instrumentation Engineers (SPIE) Conference; vol 4855).

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