PT Unknown AU Gerecht, E Musante, CF Jian, H Yngvesson, KS Dickinson, J Waldman, J Gol'tsman, GN Yagoubov, PA Voronov, BM Gershenzon, EM TI Measured results for NbN phonon-cooled hot electron bolometric mixers at 0.6-0.75 THz, 1.56 THz, and 2.5 THz SE Proc. 9[super:th] Int. Symp. Space Terahertz Technol. PY 1998 BP 105 EP 114 DE NbN HEB mixers ER