@article {2000, title = {Diffusion time and splitting of separatrices for nearly integrable}, journal = {Atti Accad. Naz. Lincei Cl. Sci. Fis. Mat. Natur. Rend. Lincei Mat. Appl., 2000, 11, 235}, number = {SISSA;90/00/M}, year = {2000}, publisher = {SISSA Library}, url = {http://hdl.handle.net/1963/1547}, author = {Massimiliano Berti and Philippe Bolle} }