1. Department of Mathematics and Statistics, College of Science, Al-Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh, Saudi Arabia
2. Department of Basic Science, Institute of Engineering, Canadian International College (CIC), Giza, Egypt
3. Department of Mathematics, Faculty of Science, Beni-Suef University, Beni-Suef, Egypt
4. Department of Electrical Engineering, Institute of Engineering, Polytechnic of Porto, Porto, Portugal
5. UISPA – LAETA/INEGI, Faculty of Engineering, University of Porto, Porto, Portugal