1. College of Mathematics and Systems Science, Shandong University of Science and Technology, Qingdao 266590, China
2. State Key Laboratory of Mining Disaster Prevention and Control Co-Founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China
3. Department of Mathematics, University of Ruhuna, 81000 Matara, Sri Lanka