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\bibitem{Gerecht_etal1997} Gerecht, E., Musante, C. F., Yngvesson, K. S., Waldman, J., Gol{\textquoteright}tsman, G. N., Yagoubov, P. A., et al. (1997). Optical coupling and conversion gain for NbN HEB mixer at THz frequencies. In \textit{Proc. 4-th Int. Semicond. Device Research Symp.} (pp. 47--50).

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