@InProceedings{Beckmann:2009,
  author      = "V. Beckmann and C. Ricci and S. Soldi and J. Alfonso-Garzón and T. Courvoisier and A. Domingo and N. Gehrels and P. Lubiński and J. Mas-Hesse and A. Zdziarski",
  title       = "Lessons learnt from INTEGRAL AGN",
  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",
}