@article{Maciejewski:2012,
  author  = "A. Maciejewski and M. Przybylska and H. Yoshida",
  title   = "Necessary conditions for the existence of additional first integrals for Hamiltonian systems with homogeneous potential",
  journal = "Nonlinearity",
  volume  = "Vol. 25",
  number  = "no 2",
  pages   = "255--277",
  year    = "2012",
}