@article{Casale:2010,
  author  = "G. Casale and G. Duval and A. Maciejewski and M. Przybylska",
  title   = "Integrability of Hamiltonian systems with homogeneous potentials of degree zero",
  journal = "Physics Letters A",
  volume  = "Vol. 374",
  number  = "no 3",
  pages   = "448--452",
  year    = "2010",
}