Efficiency dynamics on scale-free networks with tunable degree exponent Z.-G. Shao, J.-P. Sang, Z.-J. Tan, X.-W. Zou and Z.-Z. Jin Eur. Phys. J. B, 48 4 (2005) 587-591 Published online: 19 January 2006 DOI: 10.1140/epjb/e2006-00014-4