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\bibitem{Wyss_etal1999} Wyss, R. A., Karasik, B. S., McGrath, W. R., Bamble, B., \& LeDuc, H. (1999). Noise and bandwidth measurements of diffusion{\textendash}cooled Nb hot{\textendash}electron bolometer mixers at frequencies above the superconductive energy gap. In \textit{Proc. 10$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 215--229). Charlottesville, Virginia.

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