Institution: | 1.School of Mathematica and Computer Science, Ningxia Normal University, Guyuan, 756000, Ningxia, China ;2.School of Public Health and Management, Ningxia Medical University, Yinchuan, 750004, Ningxia, China ;3.School of International Trade, Shanxi University of Finance and Economics, Taiyuan, 030006, Shanxi, China ;4.Simon A. Levin Mathematical, Computational and Modeling Sciences Center, Arizona State University, Tempe, AZ, 85281, USA ;5.College of Science, University of Shanghai for Science and Technology, Shanghai, 200093, China ; |