Abstract
Etude de la dynamique des fluctuations de valence dans les systemes de terres rares ayant des niveaux 4f instables a l'aide d'un modele theorique de perturbations: theorie tres proche de la methode standard de la fonction de Green, mais sans utiliser le theoreme des amas lies. L'hybridation entre niveaux 4f et de la bande de conduction est vue en tant que perturbation; prise en compte de la correlation forte entre electrons 4f. Presentation de formules des succeptibilites dynamiques et des densites electroniques 4f dans l'approximation autocoherente d'ordre le plus faible. Confirmation des resultats obtenus par la methode de Mori a hautes temperatures
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