PT Journal AU Antipov, SV Svechnikov, SI Smirnov, KV Vakhtomin, YB Finkel, MI Goltsman, GN Gershenzon, EM TI Noise temperature of quasioptical NbN hot electron bolometer mixers at 900 GHz SO Physics of Vibrations JI Physics of Vibrations PY 2001 BP 242 EP 245 VL 9 IS 4 DE NbN HEB mixers ER