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\bibitem{Yagoubov_etal2003} Yagoubov, P. L., Hoogeveen, R. W. M., Maurellis, A. M., Mair, U., Krocka, M., Wagner, G., et al. (2003). TELIS {\textemdash} development of a new balloon borne THz/submm heterodyne limb sounder. In \textit{Proc. 14$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 204--214).

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