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\bibitem{Khosropanah_etal2007} Khosropanah, P., Gao, J. R., Laauwen, W. M., Hajenius, M., \& Klapwijk, T. M. (2007). Low noise NbN hot electron bolometer mixer at 4.3  THz. \textit{Appl. Phys. Lett.}, \textit{91}, 221111 (1 to 3).

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