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\bibitem{ThijsdeGraauw_etal2008} Thijs de Graauw, Nick Whyborn, Frank Helmich, Pieter Dieleman, Peter Roelfsema, Emmanuel Caux, et al. (2008). The Herschel-heterodyne instrument for the far-infrared (HIFI): instrument and pre-launch testing. In \textit{Proc. SPIE} (Vol. 7010, 701004).

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