The Infrared Spectrum of Comet Hele–Bopp as Seen by the Infrared Space Observatory - Leech, K.; Crovisier, J.; Bockelée-Morvan, D.; Brooke, T. Y.; Hanner, M. S.; Altieri, B.; Keller, H. U.; Lellouch, E.; Lim, T. (Springer, 1997)
http://dx.doi.org/10.1023/A:1006283614308
Keywords: TE-TZ; U