Rengel, M. Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society;
Link (Any fulltext)
Avruch, I., Beaulieu, S., Boogert, A., Marston, T., McCoey, C., Olberg, M., et al.(2011). The Heterodyne Instrument for the Far Infrared (HIFI) Observers' Manual. HIFI Instrument Control Center.