1. Department of Mathematics, Faculty of Technical and Natural Sciences, University “Ismail Qemali”, 9400 Vlora, Albania
2. Department of Mathematics, College of Science, King Khalid University, Abha 61413, Saudi Arabia
3. Department of Mathematics, College of Science, Jazan University, Jazan 45142, Saudi Arabia
4. Department of Mathematics, C.V. Raman Global University, Bhubaneswar 752054, India