Cenko, S. B., Frail, D. A., Harrison, F. A., Kulkarni, S. R., Nakar, E., Chandra, P. C., et al. (2010). The collimation and energetics of the brightest swift gamma-ray bursts. The Astrophysical Journal, 711(2), 641-654. doi:10.1088/0004-637X/711/2/641.