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\bibitem{Yagoubov_etal2003} Yagoubov PL, Hoogeveen RWM, Maurellis AM, Mair U, Krocka M, Wagner G, et al. TELIS {\textemdash} development of a new balloon borne THz/submm heterodyne limb sounder. In: Proc. 14$^{th}$ Int. Symp. Space Terahertz Technol.; 2003. p. 204--14.

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