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\bibitem{Semenov_etal2003} Semenov, A. D., H{\"u}bers, H. - W., Richter, H., Birk, M., Krocka, M., Mair, U., et al. (2003). Superconducting hot-electron bolometer mixer for terahertz heterodyne receivers. \textit{IEEE Trans. Appl. Supercond.}, \textit{13}(2), 168--171.

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