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\bibitem{Vachtomin_etal2006} Vachtomin, Y. B., Antipov, S. V., Maslennikov, S. N., Smirnov, K. V., Polyakov, S. L., Zhang, W., et al. (2006). Quasioptical hot electron bolometer mixers based on thin NBN films for terahertz region. In \textit{Proc. 16th Int. Crimean Microwave and Telecommunication Technology} (Vol. 2, pp. 688--689).

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