Long-time unbreaking correlations in the large number of degrees of   freedom Hamiltonian system
  A behaviour of molecular cluster with Lennard-Jones potential of interactions as Hamiltonian system is studied by computer simulation (molecular dynamics method). It is shown that complex periodic oscillations of the cluster as a whole are possible. This is in accordance with KAM theorem. 
O.I. Gorsky, Yu.P Kuchugurny