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\bibitem{Cherednichenko_etal1997} Cherednichenko, S., Yagoubov, P., Il{\textquoteright}In, K., Gol{\textquoteright}tsman, G., \& Gershenzon, E. (1997). Large bandwidth of NbN phonon-cooled hot-electron bolometer mixers on sapphire substrates. In \textit{Proc. 8$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 245--257).

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