Variation of the fine-structure constant: very high resolution spectrum of QSO HE 0515-4414 H. Chand, R. Srianand, P. Petitjean, B. Aracil, R. Quast and D. Reimers A&A, 451 1 (2006) 45-56 Published online: 25 April 2006 DOI: 10.1051/0004-6361:20054584