DISORDER EFFECTS ON GaP CORE LEVELS STUDIED BY ELECTRON SPECTROSCOPIES G. Dufour, E. Belin, C. Senemaud, A. Gheorghiu et M.L. Theye J. Phys. Colloques, 42 C4 (1981) C4-877-C4-880 DOI: 10.1051/jphyscol:19814192