PT Journal AU Burke, PJ Schoelkopf, RJ Prober, DE Skalare, A Karasik, BS Gaidis, MC McGrath, WR Bumble, B LeDuc, HG TI Mixing and noise in diffusion and phonon cooled superconducting hot-electron bolometers SO J. Appl. Phys. PY 1999 BP 1644 EP 1653 VL 85 IS 3 DI 10.1063/1.369299 DE HEB; mixer ER