@InProceedings{Soldi:2009,
  author      = "S. Soldi and G. Ponti and V. Beckmann and P. Lubiński",
  title       = "AGN variability at hard X-rays",
  booktitle   = "The Extreme sky : Sampling the Universe above 10 keV",
  address     = "Otranto, Włochy",
  publisher   = "[B. m.], [brak wydawcy]",
  volume      = "Proceedings of Science",
  pages       = "[6]",
  year        = "2009",
}