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Fynbo, JPU, Jakobsson, P, Prochaska, JX, Malesani, D, Ledoux, C, De Ugarte Postigo, A, Nardini, M, Vreeswijk, PM, Wiersema, K, Hiorth, J, Sollerman, J, Chen, HW, Thöne, CC, Biörnsson, G, Bloom, JS, Castro-Tirado, AJ, Christensen, L, De Cia, A, Fruchter, AS, Gorosabel, J et al, Graham, JF, Jaunsen, AO, Jensen, BL, Kann, DA, Kouveliotou, C, Levan, AJ, Maund, J, Masetti, N, Milvano-Jensen, B, Palazzi, E, Perley, DA, Pian, E, Rol, E, Schady, P, Starling, RLC, Tanvir, NR, Watson, DJ, Xu, D, Augusteiin, T, Grundhal, F, Tilting, J and Uirion, PO (2009) Low-resolution spectroscopy of gamma-ray burst optical afterglows: Biases in the swift sample and characterization of the absorbers. The Astrophysical Journal, Supplement Series, 185 (2). ISSN 0067-0049