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\bibitem{Yagubov_etal1996} Yagubov, P., Gol{\textquoteright}tsman, G., Voronov, B., Seidman, L., Siomash, V., Cherednichenko, S., et al. (1996). The bandwidth of HEB mixers employing ultrathin NbN films on sapphire substrate. In \textit{Proc. 7$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 290--302). Charlottesville, Virginia, USA.

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