@article{AIHPA_1986__45_1_1_0,
     author = {Foulon, Patrick},
     title = {G\'eom\'etrie des \'equations diff\'erentielles du second ordre},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {1--28},
     publisher = {Gauthier-Villars},
     volume = {45},
     number = {1},
     year = {1986},
     mrnumber = {856446},
     zbl = {0624.58011},
     language = {fr},
     url = {http://www.numdam.org/item/AIHPA_1986__45_1_1_0/}
}