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C. Bizdadea
Department of Physics, University of Craiova, 13 Al. I. Cuza Street, Craiova 200585, Romania
M. M. Bârcan
Department of Physics, University of Craiova, 13 Al. I. Cuza Street, Craiova 200585, Romania
I. Negru
Department of Physics, University of Craiova, 13 Al. I. Cuza Street, Craiova 200585, Romania
S. O. Saliu
Department of Physics, University of Craiova, 13 Al. I. Cuza Street, Craiova 200585, Romania