@article{AIHPA_1995__63_2_125_0,
     author = {Moszy\'nski, Marcin},
     title = {On classical intrinsically resonant formal perturbation theory},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {125--154},
     publisher = {Gauthier-Villars},
     volume = {63},
     number = {2},
     year = {1995},
     mrnumber = {1357493},
     zbl = {0832.70016},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1995__63_2_125_0/}
}