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\bibitem{deGraauw_etal2005} de Graauw T, Caux E, Guesten R, Helmich F, Pearson J, Phillips TG, et al. The Herschel-heterodyne instrument for the far-infrared (HIFI). In: Bulletin of the American Astronomical Society.; 2005. 1219. (Bulletin of the American Astronomical Society; vol 37).

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