1. School of Mathematics, China University of Mining and Technology, Xuzhou, Jiangsu, People’s Republic of China
2. School of Mathematics and Statistics, Shangqiu normal university, Shangqiu, Henan, People’s Republic of China
3. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, People’s Republic of China
4. Department of Mathematics, Nanjing University, Nanjing, Jiangsu, People’s Republic of China
5. School of Mathematics, JCAM, China University of Mining and Technology, Xuzhou, Jiangsu, People’s Republic of China
6. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, People’s Republic of China
7. Department of Mathematics, Nanjing University, Nanjing, Jiangsu, People’s Republic of China