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\bibitem{Schwaab_etal1998} Schwaab, G. W., Auen, K., Bruendermann, E., Feinaeugle, R., Gol{\textquoteright}tsman, G. N., Huebers, H. - W., et al. (1998). 2- to 6-THz heterodyne receiver array for the Stratospheric Observatory for Infrared Astronomy (SOFIA). In T. G. Phillips (Ed.), \textit{Proc. SPIE} (Vol. 3357, pp. 85--96). SPIE.

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