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\bibitem{Gershenzon+Goltsman1993} Gershenzon, E. M., \& Gol{\textquoteright}tsman, G. N. (1993). Hot electron superconductive mixers. In \textit{Proc. 4$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 618--622).

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