Collet, R. Stellar Astrophysics, MPI for Astrophysics, Max Planck Society;
Korn, A. J., Grundahl, F., Richard, O., Mashonkina, L., Barklem, P. S., Collet, R., et al. (2007). Atomic diffusion and mixing in old stars - I. Very large telescope FLAMES-UVES observations of stars in NGC 6397. Astrophysical Journal, 671(1 Part 1), 402-419. doi:10.1086/523098.