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\bibitem{Gershenzon+Goltsman1993} Gershenzon, E. M., \& Gol{\textquoteright}tsman, G. N. (1993). Hot-electron superconducting mixers. In J. R. Birch, \& T. J. Parker (Eds.), \textit{Proc. SPIE} (Vol. 2104, pp. 329--330). SPIE.

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