1. Department of Mathematics, Faculty of ScienceFayoum University Fayoum 63514 Egypt
2. Department of MathematicsRustaq College of Education, Ministry of Higher Education Rustaq 329 Oman
3. International Center for Basic and Applied Sciences Jaipur 302029 India
4. Department of MathematicsAnand International College of Engineering Jaipur 303012 India
5. Department of MathematicsHarish Chandra Research Institute Chhatnag Road Jhunsi Allahabad 211019 India