HIGH ENERGY SPECTROSCOPIES OF Cu COMPOUNDS, INCLUDING THE NEW SUPERCONDUCTORS M. GRIONI, J.C. FUGGLE, P.J.W. WEIJS, J.B. GOEDKOOP, G. ROSSI, F. SCHAEFERS, J. FINK and N. NÜCKER J. Phys. Colloques, 48 C9 (1987) C9-1189-C9-1192 DOI: 10.1051/jphyscol:19879214