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\bibitem{Schubert_etal1999} Schubert, J., Semenov, A., Gol{\textquoteright}tsman, G., H{\"u}bers, H. - W., Schwaab, G., Voronov, B., et al. (1999). Noise temperature of an NbN hot-electron bolometric mixer at frequencies from 0.7 THz to 5.2 THz. \textit{Supercond. Sci. Technol.}, \textit{12}(11), 748--750.

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