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\bibitem{Semenov_etal2003} Semenov, A., Richter, H., H{\"u}bers, H. - W., Smirnov, K., Voronov, B., \& Gol{\textquoteright}tsman, G. (2003). Development of terahertz superconducting hot-electron bolometer mixers. In \textit{Proc. 6th European Conf. Appl. Supercond.} (Vol. 181, pp. 2960--2965).

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