2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/132034The paper has been withdrawn. The revised version is shown as cond-mat/0506752 and published in Condensed Matter Physics, vol.10, No.2(50)235-248(2007) (Lviv, Ukraine).The paper has been withdrawnMesoscale and Nanoscale PhysicsStrongly Correlated ElectronsSpectral Function for the Anderson Model based on Nonequilibrium Perturbation Theorytext