@article{1619,
  author = {G. Ghirlanda and G. Ghisellini and C. Firmani and L. Nava and F. Tavecchio and D. Lazzati},
  title = {Cosmological constraints with GRBs: homogeneous medium vs. wind density profile},
  year = {2006},
  journal = {Astronomy and Astrophysics},
  volume = {452},
  pages = {839-844},
  month = {Jan-06-2006},
  issn = {0004-6361},
  url = {http://www.aanda.org/10.1051/0004-6361:20054544},
  doi = {10.1051/0004-6361:20054544},
}