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\bibitem{deGraauw_etal2006} de Graauw, T., Whyborn, N., Caux, E., Phillips, T., Stutzki, J., Tielens, X., et al. (2006). The Herschel-heterodyne instrument for the far-infrared (HIFI). In \textit{Proc. SPIE}. Orlando.

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