@article{PMIHES_1977__47__5_0,
     author = {Ivar Ekeland},
     title = {Discontinuit\'es de champs hamiltoniens et existence de solutions optimales en calcul des variations},
     journal = {Publications Math\'ematiques de l'IH\'ES},
     pages = {5--32},
     year = {1977},
     publisher = {Institut des Hautes \'Etudes Scientifiques},
     volume = {47},
     doi = {10.1007/BF02684338},
     mrnumber = {493584},
     zbl = {0447.49015},
     language = {fr},
     url = {https://pmihes.centre-mersenne.org/articles/10.1007/BF02684338/}
}