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\bibitem{Burke_etal1998} Burke, P. J., Schoelkopf, R. J., Prober, D. E., Skalare, A., Karasik, B. S., Gaidis, M. C., et al. (1998). Spectrum of thermal fluctuation noise in diffusion and phonon cooled hot-electron mixers. \textit{Appl. Phys. Lett.}, \textit{72}(12), 1516--1518.

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