Institution: | 1. Instituto de Física, Universidade de S?o Paulo, Caixa Postal 66318, S?o Paulo, 05315-970, S?o Paulo, Brazil 2. National Center on Nanostructures and Biosystems at Surfaces (S3) of INFM-CNR, c/o Dip. Fisica Univ. Modena e Reggio E., Via Campi 213/A, 41100, Modena, Italy 3. Tomsk State Pedagogical University, Komsomolskii 75, 634041, Tomsk, Russia
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