Super low noise cryoelectronic amplifier for radio astronomy and spectroscopy in a 21.0 - 23.0 GHz range with conversion of frequency into 0.5 - 2.5 GHz
J. Phys. IV France, 08 PR3 (1998) Pr3-189-Pr3-192
DOI: 10.1051/jp4:1998341