The Herschel-Heterodyne Instrument for the Far-Infrared (HIFI) Th. de Graauw, N. Whyborn, E. Caux, T. Phillips, J. Stutzki, A. Tielens, R. Güsten, F. Helmich, W. Luinge, J. Martin-Pintado et al. (7 more) EAS Publications Series, 34 (2009) 3-20 Published online: 20 December 2008 DOI: 10.1051/eas:0934001