Abstract

R. H. Miwa,1 W. Orellana,2 and G. P. Srivastava3 1Instituto de Fisica, Universidade Federal de Uberlândia, CP 593, CEP 38400-902, Uberlândia, MG, Brazil 2Departamento de Ciencias Fisicas, Facultad de Ingenieria, Universidad Andres Bello, Av. Republica 252, 837-0134, Santiago, Chile 3School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL, United Kingdom Received 3 October 2007; revised manuscript received 19 May 2008; published 11 September 2008

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