@article{BSMF_1988__116_2_171_0,
     author = {Szulkin, Andrzej},
     title = {Morse theory and existence of periodic solutions of convex hamiltonian systems},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {171--197},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {116},
     number = {2},
     year = {1988},
     doi = {10.24033/bsmf.2094},
     mrnumber = {90f:58074},
     zbl = {0669.58004},
     language = {en},
     url = {http://www.numdam.org/articles/10.24033/bsmf.2094/}
}