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\bibitem{Hajenius_etal2006} Hajenius, M., Baselmans, J. J. A., Baryshev, A., Gao, J. R., Klapwijk, T. M., Kooi, J. W., et al. (2006). Full characterization and analysis of a terahertz heterodyne receiver based on a NbN hot electron bolometer. \textit{J. Appl. Phys.}, \textit{100}(7), 074507.

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