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Frail D.A. et al (2001). "Beaming in Gamma-ray bursts: evidence for a standard energy reservoir". Astrophysical Journal Letters562: L557–L558. doi:10.1086/338119. Bibcode: 2001ApJ...562L..55F.
Podsiadlowski, Ph. et al. (2004). "The rates of hypernovae and gamma-ray bursts: implications for their progenitors". Astrophysical Journal Letters607: L17. doi:10.1086/421347. Bibcode: 2004ApJ...607L..17P.
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