1. Guangxi Key Laboratory of Hybrid Computation and IC Design Analysis College of Sciences, Guangxi University for Nationalities, Nanning 530006, Guangxi Province, P. R. China
2. Faculty of Fundamental Science, PetroVietnam University, Ba Ria, Vietnam
3. Faculty of Physics and Mathematics, Voronezh State Pedagogical University, (394043 ) Voronezh, Russia