@article{Maciejewski:2013,
  author  = "A. Maciejewski and M. Przybylska and L. Simpson and W. Szumiński",
  title   = "Non-integrability of the dumbbel and point mass problem",
  journal = "Celestial Mechanics and Dynamical Astronomy",
  volume  = "Vol. 117",
  pages   = "315--330",
  year    = "2013",
}