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\bibitem{Schwaab_etal1999} Schwaab, G. W., Sirmain, G., Schubert, J., Hubers, H. - W., Gol{\textquoteright}tsman, G., Cherednichenko, S., et al. (1999). Investigation of NbN phonon-cooled HEB mixers at 2.5 THz. \textit{IEEE Trans. Appl. Supercond.}, \textit{9}(2), 4233--4236.

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