1. School of Mathematics, Nanjing University of Aeronautics and Astronautics, Nanjing, 211106, China; Key Laboratory of Mathematical Modeling and High Performance Computing of Air Vehicles (NUAA), MIIT, Nanjing, 211106, China.
2. School of Mathematics, Nanjing University of Aeronautics and Astronautics, Nanjing, 211106, China.
3. Corresponding author. School of Mathematics, Southwestern University of Finance and Economics, Chengdu, 611130, China.