| Affiliation: | 1. Department of Mathematics, Foshan University, Foshan, Guangdong 528000, China;2. Institute of Mathematics, Lingnan Normal University, Zhanjiang, Guangdong 524048, China;1. Universidade de São Paulo, Inst. de Ciências Matemáticas e de Computação, São Carlos, SP 13560-970, Brazil;2. Department of Mathematical Sciences, Faculty of Science, Yamagata University, Kojirakawa-machi 1-4-12, Yamagata 990-8560, Japan;1. Gongqing College, Nanchang University, Jiujiang 332020, China;2. Faculty of Mathematics and Statistics, Hubei University, Wuhan 430062, China;3. School of Information Engineering, Nanchang University, Nanchang 330031, China |
