PT Journal AU Ganzevles, WFM Gao, JR de Korte, PAJ Klapwijk, TM TI Direct response of microstrip line coupled Nb THz hot-electron bolometer mixers SO Applied Physics Letters JI Appl. Phys. Lett. PY 2001 BP 2483 EP 2485 VL 79 IS 15 DI 10.1063/1.1409273 ER