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\bibitem{Kooi_etal2006} Kooi, J. W., Baselmans, J. J. A., Baryshev, A., Schieder, R., Hajenius, M., Gao, J. R., et al. (2006). Stability of heterodyne terahertz receivers. \textit{J. Appl. Phys.}, \textit{100}(6), 064904 (1 to 9).

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