High-ion absorption in seven GRB host galaxies at z = 2–4 - Evidence for both circumburst plasma and outflowing interstellar gasA. J. Fox, C. Ledoux, P. M. Vreeswijk, A. Smette and A. O. JaunsenA&A, 491 1 (2008) 189-207DOI: https://doi.org/10.1051/0004-6361:200810286
