RAMÍREZ-FALICOV MODEL RARE EARTHS TIERRAS RARAS BAJA TEMPERATURA CERIO CERIO ALFA CERIUM CERIUM-ALPHA Comments on electronic phase transition inb Ce1XLax alloys Effect af rare earth impurities on the α - γ transition in metallic Ce Effect of finite f level linewidth on the theory of the x-y transition in Ce Electronic phase transition in Ce1-X Lax alloys HYBRIDIZATION|HIBRIDIZACION IMPUREZAS IMPURITIES INTERVALO DE TEMPERATURA 0065-0273 K LANTANO LANTHANUM LOW TEMPERATURE PHASE TRANSFORMATIONS PHYSICAL PROPERTIES PROPIEDADES FISICAS TEMPERATURE RANGE 0065-0273 K TRANSFORMACIONES DE FASE Theory of the effect of impurities on the a-y transition in cerium