Why the globular cluster NGC 6752 contains no sodium-rich second-generation AGB stars Corinne Charbonnel, William Chantereau, Thibaut Decressin, Georges Meynet and Daniel Schaerer A&A, 557 (2013) L17 Published online: 19 September 2013 DOI: 10.1051/0004-6361/201322422