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\section*{1998}

Schwaab GW, Auen K, Bruendermann E, Feinaeugle R, Gol{\textquoteright}tsman GN, Huebers H-W, et al. 2- to 6-THz heterodyne receiver array for the Stratospheric Observatory for Infrared Astronomy (SOFIA). In: Phillips TG, editor. Proc. SPIE. Vol 3357. SPIE; 1998. p. 85--96.

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