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\bibitem{Schwaab_etal1999} Schwaab GW, Sirmain G, Schubert J, Hubers H-W, Gol{\textquoteright}tsman G, Cherednichenko S, et al. Investigation of NbN phonon-cooled HEB mixers at 2.5 THz. IEEE Trans Appl Supercond. 1999;9(2):4233--6.

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