Rabha M El-Ashwah
Mathematics Department, Faculty of Science, Mansoura University, New Damietta 34517, Egypt
Mohamed K Aouf
Mathematics Department, Faculty of Science, Mansoura University, Mansoura 33516, Egypt
Ali Shamandy
Mathematics Department, Faculty of Science, Mansoura University, Mansoura 33516, Egypt
Sheza M El-Deeb
Mathematics Department, Faculty of Science, Mansoura University, New Damietta 34517, Egypt