MAGNETIC EXCITATIONS IN THE INTERMEDIATE VALENCE SYSTEM Sm0.75 Y0.25S H.A. Mook, T. Penney, F. Holtzberg and M.W. Shafer J. Phys. Colloques, 39 C6 (1978) C6-837-C6-839 DOI: 10.1051/jphyscol:19786373