High-resolution abundance analysis of four red giants in the globular cluster NGC 6558 B. Barbuy, L. Muniz, S. Ortolani, H. Ernandes, B. Dias, I. Saviane, L. Kerber, E. Bica, A. Pérez-Villegas, L. Rossi and E. V. Held A&A, 619 (2018) A178 Published online: 21 November 2018 DOI: 10.1051/0004-6361/201833953