1. Party School of Shandong Provincial Committee of the Communist Party of China (Shandong Administration College), Jinan 250014, China
2. The Research Center of Theoretical System of Socialism with Chinese Characteristics in Shandong Province, Jinan 250014, China
3. Department of Mathematics, Government College University, Lahore 54000, Pakistan
4. Department of Mathematics, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand