@article{Timokhin:2007,
  author  = "A. Timokhin",
  title   = "Force-free magnetosphere of an aligned rotator with differential rotation of open magnetic field lines",
  journal = "Astrophysics and Space Science",
  volume  = "Vol. 308",
  number  = "no. 1-4",
  pages   = "575--579",
  year    = "2007",
}