PT Unknown AU Karpov, A Miller, D Stern, JA Bumble, B LeDuc, HG Zmuidzinas, J TI Low noise NbTiN 1.25 THz SIS mixer for Herschel Space Observatory SE Proc. 16[super:th] Int. Symp. Space Terahertz Technol. PY 2005 BP 450 PI Göteborg, Sweden ER