@article{AIHPA_1986__45_1_99_0,
     author = {Lacomba, Ernesto and Losco, Lucette},
     title = {Caract\'erisation variationnelle globale des flots canoniques et de contact dans leurs groupes de diff\'eomorphismes},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {99--116},
     publisher = {Gauthier-Villars},
     volume = {45},
     number = {1},
     year = {1986},
     mrnumber = {856451},
     zbl = {0605.58021},
     language = {fr},
     url = {http://www.numdam.org/item/AIHPA_1986__45_1_99_0/}
}