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\bibitem{Yazoubov_etal1998} Yazoubov, P., Kroug, M., Merkel, H., Kollberg, E., Gol{\textquoteright}tsman, G., Lipatov, A., et al. (1998). Quasioptical NbN phonon-cooled hot electron bolometric mixers with low optimal local oscillator power. In \textit{Proc. 9$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 131--140).

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