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Starling, R. L. C. and Wijers, R. A. M. J. and Hughes, M. A. and Tanvir, N. R. and Vreeswijk, P. M. and Rol, E. and Wiersema, K. and Salamanca, I. (2005) Spectroscopy of the optical afterglow of GRB 021004: Origin of the blue-shifted hydrogen lines. Il nuovo cimento C, 28 (4\5). pp. 553-556. ISSN 1826-9885