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\bibitem{Kawamura_etal1999} Kawamura, J. H., Tong, C. - Y. E., Blundell, R., Cosmo Papa, D., Hunter, T. R., Gol{\textquoteright}tsman, G., et al. (1999). An 800 GHz NbN phonon-cooled hot-electron bolometer mixer receiver. \textit{IEEE Trans. Appl. Supercond.}, \textit{9}(2), 3753--3756.

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