The Gaia-ESO Survey - Mg-Al anti-correlation in iDR4 globular clusters E. Pancino, D. Romano, B. Tang, G. Tautvaišienė, A. R. Casey, P. Gruyters, D. Geisler, I. San Roman, S. Randich, E. J. Alfaro et al. (17 more) A&A, 601 (2017) A112 Published online: 15 May 2017 DOI: 10.1051/0004-6361/201730474