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

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