@article{PSMIR_1975___S4_A27_0,
     author = {Zenhder, E.},
     title = {Hamiltonian {Systems} {Close} to {Integrable} {Systems}},
     journal = {Publications des s\'eminaires de math\'ematiques et informatique de Rennes},
     eid = {27},
     pages = {1--12},
     publisher = {D\'epartement de Math\'ematiques et Informatique, Universit\'e de Rennes},
     number = {S4},
     year = {1975},
     language = {en},
     url = {http://archive.numdam.org/item/PSMIR_1975___S4_A27_0/}
}