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\bibitem{Yagoubov_etal1999} Yagoubov, P., Kroug, M., Merkel, H., Kollberg, E., Schubert, J., Hubers, H. - W., et al. (1999). Heterodyne measurements of a NbN superconducting hot electron mixer at terahertz frequencies. \textit{IEEE Trans. Appl. Supercond.}, \textit{9}(2), 3757--3760.

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