Uncovering evolutionary ages of nodes in complex networks G.-M. Zhu, H.J. Yang, R. Yang, J. Ren, B. Li and Y.-C. Lai Eur. Phys. J. B, 85 3 (2012) 106 Published online: 26 March 2012 DOI: 10.1140/epjb/e2012-21019-2