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\bibitem{Huebers_etal2000} Huebers, H. - W., Semenov, A., Schubert, J., Gol{\textquoteright}tsman, G. N., Voronov, B. M., Gershenzon, E. M., et al. (2000). NbN hot-electron bolometer as THz mixer for SOFIA. In R. K. Melugin, \& H. - P. Roeser (Eds.), \textit{Proc. SPIE} (Vol. 4014, pp. 195--202). SPIE.

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