@conference{1233,
  author = {D. Proga and A. MacFadyen and Phillip Armitage and Mitchell Begelman},
  title = {MHD Simulations of the Collapsar Model for GRBs},
  year = {2004},
  journal = {AIP},
  publisher = {AIP},
  address = {Sante Fe, New Mexico (USA)},
  doi = {10.1063/1.1810870},
}