Integrability of hamiltonian systems and differential Galois groups of higher variational equations

@article{MoralesRuiz2007IntegrabilityOH,
  title={Integrability of hamiltonian systems and differential Galois groups of higher variational equations},
  author={Juan Jos'e Morales-Ruiz and Jean Pierre Ramis and C. Sim{\'o}},
  journal={Annales Scientifiques De L Ecole Normale Superieure},
  year={2007},
  volume={40},
  pages={845-884}
}
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Integrability and Non-Integrability of Planar Hamiltonian Systems of Cosmological Origin
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Non-integrability of Hénon-Heiles system and a theorem of Ziglin
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