The extinction curves of star-forming regions from z = 0.1 to 6.7 using GRB afterglow spectroscopyT. Zafar, D. Watson, J. P. U. Fynbo, D. Malesani, P. Jakobsson and A. de Ugarte PostigoA&A, 532 (2011) A143DOI: https://doi.org/10.1051/0004-6361/201116663