Abstract
Petrucio Barrozo,1,2 Andre A. Moreira,1 J. Albino Aguiar,2 and Jose S. Andrade, Jr.1,3 1Departamento de Fisica, Universidade Federal do Ceara, 60455-760 Fortaleza, CE, Brazil 2Departamento de Fisica, Universidade Federal de Pernambuco, 50670-901 Recife, PE, Brazil 3National Institute of Science and Technology for Complex Systems, Xavier Sigaud 150, 22290-180 Rio de Janeiro, RJ, Brazil Received 28 August 2009; published 28 September 2009
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