| Affiliation: | 1. Department of Mathematics and Physics, North China Electric Power University, Beijing, 102206, PR China;2. Department of Applied Mathematics, Beijing Institute of Technology, Beijing, 100081, PR China;1. Department of Applied Mathematics & Humanities, S.V. National Institute of Technology, Surat 395007, Gujarat, India;2. Department of Mathematics and Applied Mathematics, University of Pretoria, Lynnwood Road, Pretoria 0002, South Africa;3. Dipartimento di Matematica e Informatica, Università degli Studi di Palermo, Via Archirafi 34, 90123 Palermo, Italy |
