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\bibitem{Schwaab_etal1999} Schwaab, G. W., H{\"u}bers, H. - W., Schubert, J., Erichsen, P., Gol{\textquoteright}tsman, G., Semenov, A., et al. (1999). A high resolution spectrometer for the investigation of molecular structures in the THZ range. In \textit{Proc. 10$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 530--538).

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