Lithium and sodium in the globular cluster M 4 - Detection of a Li-rich dwarf star: preservation or pollution?L. Monaco, S. Villanova, P. Bonifacio, E. Caffau, D. Geisler, G. Marconi, Y. Momany and H.-G. LudwigA&A, 539 (2012) A157DOI: https://doi.org/10.1051/0004-6361/201117709
