Kaloshin & Saprykina (2012). Kaloshin, Vadim; Saprykina, Maria, An example of a nearly integrable Hamiltonian system with a trajectory dense in a set of maximal Hausdorff dimension, Communications in Mathematical Physics, 2012, 315 (3): 643–697, MR 2981810, doi:10.1007/s00220-012-1532-x.
Kaloshin & Saprykina (2012). Kaloshin, Vadim; Saprykina, Maria, An example of a nearly integrable Hamiltonian system with a trajectory dense in a set of maximal Hausdorff dimension, Communications in Mathematical Physics, 2012, 315 (3): 643–697, MR 2981810, doi:10.1007/s00220-012-1532-x.