1. Mathematics Department, College of Science, Qassim University , P.O. Box 6644 , Buraydah 51452 , Saudi Arabia
2. Department of Mathematics, Faculty of Science, Mansoura University , 35516 Mansoura , Egypt
3. Section of Mathematics, International Telematic University Uninettuno , CorsoVittorio Emanuele II, 39 , 00186 Roma , Italy
4. Department of Mathematics, Faculty of Education – Al-Nadirah, Ibb University , Ibb , Yemen
5. Department of Mathematics and General Sciences, Prince Sultan University , Riyadh 11586 , Saudi Arabia
6. Department of Medical Research, China Medical University , Taichung 40402 , Taiwan
7. Department of Mathematics, JIS College of Engineering , Kalyani 741235 , India