@article{AIHPA_1975__22_3_173_0,
     author = {Bel, Luis and Martin, Jesus},
     title = {Formes hamiltoniennes et syst\`emes conservatifs},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {173--199},
     publisher = {Gauthier-Villars},
     volume = {22},
     number = {3},
     year = {1975},
     mrnumber = {378697},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/item/AIHPA_1975__22_3_173_0/}
}