author      = "M. Türler and T. Courvoisier and P. Lubiñski and A. Neronov and N. Produit and R. Walter and M. Chernyakova",
  title       = "INTEGRAL hard X-ray spectra of the cosmic X-ray background and the Galactic ridge",
  booktitle   = "The Extreme sky : Sampling the Universe above 10 keV",
  address     = "Otranto, W³ochy",
  publisher   = "[B. m.], [brak wydawcy]",
  volume      = "Proceedings of Science",
  pages       = "[6]",
  year        = "2009",