Marino, A. F. Stellar Astrophysics, MPI for Astrophysics, Max Planck Society;
Milone, A. P., Piotto, G., Bedin, L. R., King, I. R., Anderson, J., Marino, A. F., et al. (2012). Multiple stellar populations in 47 Tucanae. The Astrophysical Journal, 744(1): 58, pp. 1-22. doi:10.1088/0004-637X/744/1/58.