| Affiliation: | 1. School of Mathematical Sciences, Qufu Normal University, Qufu Shandong 273165, PR China;2. College of Mathematics and Information Science, Henan Normal University, Xinxiang Henan 453007, PR China;3. Nanjing Research Institute of Electronic Engineering, Nanjing Jiangsu 210007, PR China;1. Departamento de Matemática, Universidade Estadual de Maringá, Avenida Colombo, 5790, 87020-900, Maringá, PR, Brazil;2. Instituto de Matemática, Universidade Federal do Rio Grande do Sul, 91509-900, Porto Alegre, RS, Brazil;1. University of Bucharest, Faculty of Mathematics and Computer Science, Str. Academiei 14, Bucharest 1, RO-010014, Romania;2. Institute of Mathematics of the Romanian Academy, PO-Box 1-764 RO-014700, Bucharest, Romania;1. Wayne State University, Detroit, MI 48202, USA;2. Eurasian National University, Astana, Kazakhstan;3. FES-Cuautitlán, UNAM, Campo 1, Mexico |
