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\bibitem{Kawamura_etal2001} Kawamura, J., Tong, C. - Y. E., Blundell, R., Papa, D. C., Hunter, T. R., Patt, F., et al. (2001). Terahertz-frequency waveguide NbN hot-electron bolometer mixer. \textit{IEEE Trans. Appl. Supercond.}, \textit{11}(1), 952--954.

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