X-shooter GTO: evidence for a population of extremely metal-poor, alpha-poor stars
E. Caffau, P. Bonifacio, P. François, L. Sbordone, M. Spite, L. Monaco, B. Plez, F. Spite, S. Zaggia, H.-G. Ludwig, R. Cayrel, P. Molaro, S. Randich, F. Hammer and V. Hill
A&A, 560 (2013) A15
DOI: https://doi.org/10.1051/0004-6361/201322213
