1. Department of Mathematics, College of Science, Yarmouk University, Irbid 21163, Jordan
2. Department of Mathematical Sciences, UAE University, Sheik Khalifa Bin Zayed St, Asharij Abu Dhabi, Al Ain, UAE
3. Department of Computer Science and Mathematics, Lebanese American University, Beirut, Lebanon
4. Department of Mathematics, Cankaya University, Ankara, Turkey
5. Institute of Space Sciences, Magurele-Bucharest, Romania