Institution: | 1. Department of Mathematics, Xinyang Teacher''s College, Xinyang 464000, People''s Republic of China;2. Department of Mathematics, Suzhou University, Suzhou 215006, People''s Republic of China;1. Department of Management, Osaka University of Commerce, 4-1-10 Mikuriyasakaemachi, Higashiosaka, Osaka 577-0036, Japan;2. Division of Natural Science, Faculty of Advanced Science and Technology, Kumamoto University, 2-40-1 Kurokami, Kumamoto 860-8555, Japan |