Institution: | 1. Universidade Federal de S?o Carlos-UFSCar, Sorocaba, SP, CEP 18052-780, Brazil 2. Instituto de Física de S?o Carlos-USP, S?o Carlos, SP, CEP 13560-250, Brazil 3. Centro Universitário Central Paulista-UNICEP, S?o Carlos, SP, CEP 13563-470, Brazil
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