@article{AIF_1999__49_4_1387_0,
     author = {Grifone, Joseph and Muzsnay, Zolt\'an},
     title = {Sur le probl\`eme inverse du calcul des variations : existence de lagrangiens associ\'es \`a un spray dans le cas isotrope},
     journal = {Annales de l'Institut Fourier},
     pages = {1387--1421},
     publisher = {Association des Annales de l{\textquoteright}institut Fourier},
     volume = {49},
     number = {4},
     year = {1999},
     doi = {10.5802/aif.1722},
     mrnumber = {2000d:49035},
     zbl = {0939.58023},
     language = {fr},
     url = {http://www.numdam.org/articles/10.5802/aif.1722/}
}