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\bibitem{Hoogeveen_etal2003} Hoogeveen, R. W. M., Yagoubov, P. A., Maurellis, A., Koshelets, V. P., Shitov, S. V., Mair, U., et al. (2003). New cryogenic heterodyne techniques applied in TELIS: the balloonborne THz and submillimeter limb sounder for atmospheric research. In M. Strojnik (Ed.), \textit{Proc. SPIE} (Vol. 5152, pp. 347--355). SPIE.

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