@article{SEDP_1979-1980____A15_0,
     author = {Ekeland, I.},
     title = {Oscillations forc\'ees de syst\`emes hamiltoniens non lin\'eaires},
     journal = {S\'eminaire \'Equations aux d\'eriv\'ees partielles (Polytechnique) dit aussi "S\'eminaire Goulaouic-Schwartz"},
     note = {talk:14},
     pages = {1--8},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     year = {1979-1980},
     mrnumber = {600699},
     zbl = {0495.70028},
     language = {fr},
     url = {http://www.numdam.org/item/SEDP_1979-1980____A15_0/}
}