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\bibitem{HansEkstrom_etal1995} Hans Ekstrom, Karasik, B. S., Kollberg, E. L., \& Sigfrid Yngvesson. (1995). Conversion gain and noise of niobium superconducting hot{\textendash}electron{\textendash}mixers. \textit{IEEE Trans. Appl. Supercond.}, \textit{43}(4), 938--947.

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