@article{01184354, title = {On the problem of stability for near to integrable Hamiltonian systems.}, journal = {Documenta Mathematica}, year = {1998}, pages = {143-152}, zbl = {0910.58024}, language = {en}, url = {http://dml.mathdoc.fr/item/01184354} }
Giorgilli, Antonio. On the problem of stability for near to integrable Hamiltonian systems.. Documenta Mathematica, (1998), pp. 143-152. http://gdmltest.u-ga.fr/item/01184354/