Affiliation: | 1. College of Mathematics and Physics, China University of Geosciences, Wuhan, People's Republic of China;2. Faculty of Information Technology, Macau University of Science and Technology, Taipa, Macao, People's Republic of China;3. Colledge of Mathematics, Nanjing University of Posts and Telecommunications, Nanjing, People's Republic of China;4. Department of Mathematics, Jinan University, Guangzhou, People's Republic of China |