PT Unknown AU Klaassen, TO Hovenier, JN Adam, AJL Fischer, J Jakob, G Poglitsch, A Redlich, B TI Terahertz calorimetry for the Herschel Space Observatory SE Proc. 29th IRMMW / 12th THz PY 2004 BP 815 EP 816 DE mirror; reflection index; emissivity; calorimetry; space observatory; terahertz; THz ER