ENERGY DEPENDENCE OF PROTON INDUCED L-SUBSHELL IONIZATION CROSS SECTION RATIOS FOR Ag A.M. COSTA, F. PARENTE, M.T. COSTA-LIMA and M.T. RAMOS J. Phys. Colloques, 48 C9 (1987) C9-255-C9-258 DOI: 10.1051/jphyscol:1987943