1. China University of Mining and Technology, State Key Laboratory for Geomechanics and Deep Underground Engineering, Xuzhou, People’s Republic of China + China University of Mining and Technology, School of Mechanics and Civil Engineering, Xuzhou, People’s
2. University of Victoria, Department of Mathematics and Statistics, Victoria, British Columbia VW R, Canada + China Medical University, Taichung, Taiwan, Republic of China
3. University of Aveiro, Center for Research and Development in Mathematics and Applications (CIDMA), Department of Mathematics, Aveiro, Portugal
4. Guelma University, Department of Mathematics, Guelma, Algeria