@conference{1555,
  author = {G. Stratta and Rosalba Perna and D. Lazzati and Fabrizio Fiore and A. Antonelli and M. Conciatore},
  title = {Dust extinction properties of a sample of bright X-rays afterglows},
  year = {2005},
  publisher = {Societa Italiana di Fisica},
  note = {JILA Pub. 7708},
}