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