1. Department of Mathematics, Abdul Wali Khan University Mardan, Khyber Pakhtunkhwa, Pakistan
2. Department of Mathematics, College of Arts and Sciences, Wadi Aldawaser, Prince Sattam bin Abdulaziz University, Saudi Arabia
3. Department of mathematics, University of Malakand, Chakdara Dir (L), Khyber Pakhtunkhwa, Pakistan
4. Department of Mathematics and Statistics, College of Science, Taif University, P. O. Box 11099, Taif 21944, Saudi Arabia
5. Department of Mathematics, College of Sciences, King Khalid University, Abha 61413, Saudi Arabia