@conference{1424,
  author = {D. Lazzati and Mitchell Begelman and G. Ghirlanda and G. Ghisellini and C. Firmani},
  title = {GRB jets inside and outside the star: precursors and cosmological implications},
  year = {2005},
  journal = {unknown},
  url = {http://arxiv.org/pdf/astro-ph/0503630v1.pdf},
  note = {JILA Pub. 7546},
}