1. College of Science, Hunan City University, Yiyang 413000, China
2. Department of Mathematics, Abdul Wali Khan University, Mardan 23200, Khyber Pakhtunkhwa, Pakistan
3. Institute for Ground Water Studies, Faculty of Natural and Agricultural Sciences, University of the Free State, Bloemfontein, South Africa
4. Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, King Khalid University, P.O. Box 61413, Abha 9088, Saudi Arabia
5. Department of Mathematics, College of Sciences, King Khalid University, Abha 61413, Saudi Arabia