VALENCY STATES PHYSICAL PROPERTIES 6 KONDO EFFECT 4 HAMILTONIAN FUNCTION 3 KUBO THEORY 3 A note on the equation of state for systems that underqo valence changes 2 ESTADOS DE VALENCIA 2 FERMI LEVEL 2 FLUCTUATIONS 2 HAMILTONIANS 2 INTERMEDIATE VALENCE SYSTEM 2 IONIZATION 2 Intermediate valence. Phase diagram and kondo behaviour in a simple model 2 Intermediate-valence effects on the phase diagram of NiS2_Xsex 2 Localised description of valence fluctuations 2 MÖSSBAUER EFFECT 2 PHASE DIAGRAMS 2 PHASE TRANSFORMATIONS 2 RARE EARTH COMPOUNDS 2 REACCIONES IONICAS 2 SEMICONDUCTOR DEVICES 2 SPIN-SPIN INTERACTION 2 STOCKBARGER METHOD 2 THERMODYNAMIC 2 Theory of Mössbauer effect in intermediate-valence compounds 2 CERIUM 1 CRYSTAL DEFECTS 1 ELECTRICAL RESISTIVITY 1 EQUIPMENT SURVEYS 1 Evidence for valence fluctuaction in the CeSn3 compound 1