1. School of Mathematics and Statistics Xi’an Jiaotong University Xi’an, Shaanxi 710049, P. R. China
2. Department of Mathematical Sciences Federal University of Technology, Akure 2340001, Nigeria
3. Faculty of Natural and Agricultural Sciences Institute for Groundwater Studies, University of the Free State Bloemfontein 9300, South Africa
4. Department of Chemical Engineering College of Engineering Jazan University, Jazan 45142, Saudi Arabia