| Affiliation: | 1. School of Mathematics Sciences, Inner Mongolia University, Hohhot 010021, PR China;2. Department of Mathematics, Champlain College Saint-Lambert, Saint-Lambert, Quebec, J4P 3P2, Canada;3. Department of Mathematics and Statistics, McGill University, Montreal, Quebec, H3A 2K6, Canada;1. School of Mathematics and Statistics, North China University of Water Resources and Electric Power, Zhengzhou 450011, PR China;2. Department of Mathematics, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, PR China;3. Faculty of Science and Engineering, Waseda University, Tokyo 169-8555, Japan |
