1. College of Mathematics Nanjing University of Aeronautics and Astronautics Nanjing China
2. School of Mathematics and Physics Anqing Normal University Anqing China
3. College of Continuing Education Nanjing University of Aeronautics and Astronautics Nanjing China
4. School of Mathematics Southeast University Nanjing China
5. Yonsei Frontier Lab Yonsei University Seoul South Korea