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\bibitem{Richter_etal2004} Richter, H., Semenov, A., Hubers, H. - W., Smirnov, K., Gol{\textquoteright}tsman, G., \& Voronov, B. (2004). Phonon cooled hot-electron bolometric mixer for 1-5 THz. In \textit{Proc. 29th IRMMW / 12th THz} (pp. 241--242).

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