1. Department of Mathematics, College of Science, University of Hail, Hail 2440, Saudi Arabia
2. Department of Mathematics, Faculty of Science, Mansoura University, Mansoura 35516, Egypt
3. Section of Mathematics, International Telematic University Uninettuno, Corso Vittorio Emanuele II, 39, 00186 Roma, Italy
4. Electrical Engineering Department, Mansoura University, Mansoura 35516, Egypt
5. Département de Mathématiques, Faculté Des Sciences, Université de Lomé, 01 BP 1515 Lomé, Togo
6. Department of Automated Electrical Systems, Ural Power Engineering Institute, Ural Federal University, 620002 Yekaterinburg, Russia