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\bibitem{Tol_etal2005} Tol, J. van, Brunel, L. - C., \& Wylde, R. J. (2005). A quasioptical transient electron spin resonance spectrometer operating at 120 and 240 GHz. \textit{Rev. Sci. Instrum.}, \textit{76}(7), 074101 (1 to 8).

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