@article{Hascoet:2011g2, author = "Hascoet, Romain and Vennin, Vincent and Daigne, Frédéric and Mochkovitch, Robert", title = "{Do Fermi-LAT observations really imply very large Lorentz factors in GRB outflows ?}", doi = "10.22323/1.123.0104", journal = "PoS", year = 2011, volume = "Texas 2010", pages = "104" }