Generalized Zipf's law in proportional voting processes M. L. Lyra, U. M. S. Costa, R. N. Costa Filho and J. S. Andrade jr. Europhys. Lett., 62 1 (2003) 131-137 Published online: 01 March 2003 DOI: 10.1209/epl/i2003-00371-6