@article{AIHPA_1985__42_3_215_0,
     author = {Graffi, S. and Grecchi, V. and Silverstone, H. J.},
     title = {Resonances and convergence of perturbation theory for {N-body} atomic systems in external {AC-electric} field},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {215--234},
     publisher = {Gauthier-Villars},
     volume = {42},
     number = {3},
     year = {1985},
     mrnumber = {797273},
     zbl = {0594.46065},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1985__42_3_215_0/}
}