@article{Maciejewski:2004,
  author  = "A. Maciejewski and M. Przybylska",
  title   = "Non-integrability of the generalized two fixed centres problem",
  journal = "Celestial Mechanics and Dynamical Astronomy",
  number  = "no 89",
  pages   = "145--164",
  year    = "2004",
}