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\bibitem{Lobanov_etal2011} Lobanov, Y. V., Tong, C. - Y. E., Hedden, A. S., Blundell, R., Voronov, B. M., \& Gol{\textquoteright}tsman, G. N. (2011). Direct measurement of the gain and noise bandwidths of HEB mixers. \textit{IEEE Trans. Appl. Supercond.}, \textit{21}(3), 645--648.

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