PT Journal AU Svechnikov, SI Antipov, SV Vakhtomin, YB Goltsman, GN Gershenzon, EM Cherednichenko, SI Kroug, M Kollberg, E TI Conversion and noise bandwidths of terahertz NbN hot-electron bolometer mixers SO Physics of Vibrations JI Physics of Vibrations PY 2001 BP 205 EP 210 VL 9 IS 3 DE NbN HEB mixers ER