PHONON SPECTROSCOPY OF CHROMIUM-DOPED GALLIUM ARSENIDE USING SUPERCONDUCTING TUNNEL JUNCTIONS M. Hamdache, P.J. King, D.T. Murphy et V.W. Rampton J. Phys. Colloques, 42 C6 (1981) C6-664-C6-666 DOI: 10.1051/jphyscol:19816194