@article{Gil:2007,
  author  = "J. Gil and G. Melikidze and B. Zhang",
  title   = "X-ray pulsar radiation from polar caps heated by back-flow bombardment",
  journal = "Monthly Notices of the Royal Astronomical Society",
  volume  = "Vol. 376",
  pages   = "L67--L71",
  year    = "2007",
}