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\bibitem{Yagoubov_etal1998} Yagoubov, P., Kroug, M., Merkel, H., Kollberg, E., Gol{\textquoteright}tsman, G., Svechnikov, S., et al. (1998). Noise temperature and local oscillator power requirement of NbN phonon-cooled hot electron bolometric mixers at terahertz frequencies. \textit{Appl. Phys. Lett.}, \textit{73}(19), 2814--2816.

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