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\bibitem{Huebers_etal1999} Huebers, H. - W., Schubert, J., Semenov, A., Gol{\textquoteright}tsman, G. N., Voronov, B. M., Gershenzon, E. M., et al. (1999). NbN phonon-cooled hot-electron bolometer as a mixer for THz heterodyne receivers. In J. M. Chamberlain (Ed.), \textit{Proc. SPIE} (Vol. 3828, pp. 410--416). Spie.

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