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\bibitem{Semenov_etal1997} Semenov AD, Gousev YP, Renk KF, Voronov BM, Gol{\textquoteright}tsman GN, Gershenzon EM, et al. Noise characteristics of a NbN hot-electron mixer at 2.5 THz. IEEE Trans Appl Supercond. 1997;7(2):3572--5.

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