@article{Ghirlanda:20165O,
  author = "Ghirlanda, Giancarlo",
  title = "{Bulk motion and collimation of Gamma Ray Bursts}",
  doi = "10.22323/1.237.0027",
  journal = "PoS",
  year = 2016,
  volume = "FRAPWS2014",
  pages = "027"
}