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\bibitem{Hajenius_etal2004} Hajenius, M., Baselmans, J. J. A., Gao, J. R., Klapwijk, T. M., de Korte, P. A. J., Voronov, B., et al. (2004). Low noise NbN superconducting hot electron bolometer mixers at 1.9 and 2.5 THz. \textit{Supercond. Sci. Technol.}, \textit{17}(5), S224--S228.

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