INTERMEDIATE VALENCE : THEORETICAL MODELS FOR ANOMALOUS RARE-EARTH ALLOYS AND COMPOUNDS B. Coqblin, A.K. Bhattacharjee, R. Jullien et J. Flouquet J. Phys. Colloques, 41 C5 (1980) C5-297-C5-315 DOI: 10.1051/jphyscol:1980551