1. Mathematics Department, Cebu Normal University, Cebu City, Phillipines, 6000
2. Research Institute for Computational Mathematics and Physics, Cebu Normal University, Cebu City, Philippines, 6000
3. Gazi University, Faculty of Science, Department of Mathematics, Teknik okullar, Ankara, Turkey
4. Akdeniz University, Faculty of Science, Department of Mathematics, Antalya, Turkey
5. Department of Mathematical Sciences, Sol Plaatje University, Kimberley, 8301, South Africa