R. F. Knacke

The thermal infrared spectra of comets Hale-Bopp and 103P/Harley 2 observed with the Infrared Space Observatory

H. U. Keller, Emmanuel Lellouch, Martha S. Hanner, 2000 .

Broadband infrared photometry of comet Hale-Bopp with ISOPHOT ?

Manfred Stickel, John C. Zarnecki, Dietrich Lemke, 2001 .