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\bibitem{Kawamura_etal1995} Kawamura, J., Blundell, R., Tong, C. - Y. E., Gol{\textquoteright}tsman, G., Gershenzon, E., \& Voronov, B. (1995). NbN hot-electron mixer measurements at 200 GHz. In \textit{Proc. 6$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 254--261).

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