USE OF LIII XANES FOR THE DETERMINATION OF ATOMIC RELAXATION IN MIXED VALENT RARE EARTH SYSTEMS E. BEAUREPAIRE, J.P. KAPPLER, G. KRILL et F. GAUTIER J. Phys. Colloques, 47 C8 (1986) C8-971-C8-974 DOI: 10.1051/jphyscol:19868186