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\bibitem{Vahtomin_etal2002} Vahtomin, Y. B., Finkel, M. I., Antipov, S. V., Voronov, B. M., Smirnov, K. V., Kaurova, N. S., et al. (2002). Gain bandwidth of phonon-cooled HEB mixer made of NbN thin film with MgO buffer layer on Si. In Harvard university (Ed.), \textit{Proc. 13$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 259--270). Cambridge, MA, USA.

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