1. State Key Laboratory for Geo-Mechanics and Deep Underground Engineering, and School of Mathematics, China University of Mining and Technology, Xuzhou, China + Department of Mathematics, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia + Department of Mathematics, College of Science, Kyung Hee University, Seoul, Republic of Korea
2. Mathematics Department, Faculty of Sciences, Sohag University, Sohag, Egypt + Center for Photonics and Smart Materials (CPSM), Zewail City of Science and Technology, Zewail, Egypt
3. Department of Mathematics, Quaid-i-Azam University, Islamabad, Pakistan