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\bibitem{Dzardanov_etal1994} Dzardanov, A., Ekstrom, H., Gershenzon, E., Gol{\textquoteright}tsman, G., Jacobsson, S., Karasik, B., et al. (1994). Hot-electron superconducting mixers for 20-500 GHz operation. In \textit{Proc. Int. Conf. on Millimeter and Submillimeter Waves and Appl.} (Vol. 2250, pp. 276--278).

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