Age estimations of M 31 globular clusters from their spectral energy distributions J. Ma, X. Zhou, D. Burstein, Y. Yang, Z. Fan, J. Chen, Z. Jiang, Z. Wu, J. Wu and T. Zhang A&A, 449 1 (2006) 143-149 Published online: 16 March 2006 DOI: 10.1051/0004-6361:20054157