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