| Affiliation: | 1. Department of Physics, Kyungpook National University, 80 Daehakro, Bukgu, Daegu, 702-701, South Korea;2. Asia Pacific Center for Theoretical Physics, Pohang, Gyeongbuk, 790-784, South Korea;3. Department of Physics, Pohang University of Science and Technology, 790-784, South Korea;1. Departamento de Física, Universidade Estadual de Maringá, Av. Colombo, 5790, 87020-900 Maringá, Paraná, Brazil;2. Universidade Tecnológica Federal do Paraná, Campus Campo Mourão, 87301-006 Campo Mourão, Paraná, Brazil;3. Departamento de Física, Universidade Estadual de Londrina, Campus Universitário, 86051-990 Londrina, Paraná, Brazil |
