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\bibitem{Tong_etal1999} Tong, C. E., Blundell, R., Papa, D. C., Smith, M., Kawamura, J., Gol{\textquoteright}tsman, G., et al. (1999). An all solid-state superconducting heterodyne receiver at terahertz frequencies. \textit{IEEE Microw. Guid. Wave Lett.}, \textit{9}(9), 366--368.

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