MIXED VALENCE STATE OF Sm ON THE SURFACE OF AMORPHOUS La80-xSmxAu20 ALLOYS G. Krill, A. Amamou, A. Berrada, J. Durand and N. Hassanain J. Phys. Colloques, 41 C8 (1980) C8-799-C8-802 DOI: 10.1051/jphyscol:19808198