@article{MAN_1990__288_1_164728,
     author = {Vittorio Coti Zelati and Ivar Ekeland and Eric S\'er\'e},
     title = {A variational approach to homoclinic orbits in {Hamiltonian} systems.},
     journal = {Mathematische Annalen},
     pages = {133--160},
     publisher = {mathdoc},
     volume = {288},
     number = {1},
     year = {1990},
     zbl = {0731.34050},
     url = {http://geodesic.mathdoc.fr/item/MAN_1990__288_1_164728/}
}