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\bibitem{Schubert_etal1999} Schubert, J., Semenov, A., H{\"u}bers, H. - W., Gol{\textquoteright}tsman, G., Schwaab, G., Voronov, B., et al. (1999). Broad-band terahertz NbN hot-electron bolometric mixer. In \textit{Inst. Phys. Conf.} (Vol. 167, pp. 663--666).

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