1. Department of Mathematics, College of Science, University of Ha'il, Ha'il 2440, Saudi Arabia
2. Department of Automated Electrical Systems, Ural Power Engineering Institute, Ural Federal University, Yekaterinburg 620002, Russia; a.a.abdelmenaem@urfu.ru
3. Department of Mathematics, Faculty of Science, Mansoura University, Mansoura 35516, Egypt; tshassan@mans.edu.eg
4. Section of Mathematics, International Telematic University Uninettuno, Corso Vittorio Emanuele II 39, Roma 00186, Italy