@article{Turek:2000,
  author  = "M. Turek and P. Rozmej and R. Arvieu",
  title   = "Spin-orbit pendulum ( relativistic extension. )",
  journal = "Acta Physica Polonica B",
  volume  = "Vol. 31",
  number  = "no 2",
  pages   = "517--521",
  year    = "2000",
}