Promotion of cooperation induced by nonuniform payoff allocation in spatial public goods game D. Peng, H.-X. Yang, W.-X. Wang, G. R. Chen and B.-H. Wang Eur. Phys. J. B, 73 3 (2010) 455-459 Published online: 15 January 2010 DOI: 10.1140/epjb/e2010-00008-7