1. Mathematics Department, Faculty of Science, King Abdulaziz University, Jeddah 21521, Saudi Arabia
2. Department of Mathematics, Shaheed Benazir Bhutto University, Sheringal, Dir Upper, 18000 Khyber Pakhtunkhwa, Pakistan
3. Department of Mathematical Sciences, College of Science, Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia