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\bibitem{Semenov_etal2003} Semenov AD, H{\"u}bers H-W, Richter H, Birk M, Krocka M, Mair U, et al. Superconducting hot-electron bolometer mixer for terahertz heterodyne receivers. IEEE Trans. Appl. Supercond.. 2003;13(2):168--71.

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