@article{Gil:2001,
  author  = "J. Gil and D. Khechinashvili and G. Melikidze",
  title   = "On the optical pulsations from the Geminga pulsar",
  journal = "Astrophysical Journal",
  number  = "no 551",
  pages   = "867--873",
  year    = "2001",
}