Sulphur and zinc abundances in Galactic halo stars revisitedP. E. Nissen, C. Akerman, M. Asplund, D. Fabbian, F. Kerber, H. U. Käufl and M. PettiniA&A, 469 1 (2007) 319-330DOI: https://doi.org/10.1051/0004-6361:20077344