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\bibitem{Ganzevles_etal2001} Ganzevles, W. F. M., Gao, J. R., de Korte, P. A. J., \& Klapwijk, T. M. (2001). Direct response of microstrip line coupled Nb THz hot-electron bolometer mixers. \textit{Appl. Phys. Lett.}, \textit{79}(15), 2483--2485.

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