Borel summability beyond the factorial growth V. Grecchi; M. Maioli — 1984 Annales de l'I.H.P. Physique théorique
Resonances and convergence of perturbation theory for N-body atomic systems in external AC-electric field S. Graffi; V. Grecchi; H. J. Silverstone — 1985 Annales de l'I.H.P. Physique théorique