1. Institut Supérieur D'Informatique et des Technologies de Communication de Hammam Sousse, Université de Sousse, Route GP1-4011, Hammam Sousse, Tunisia
2. Department of Mathematics, The Hashemite University, P.O. Box 13115, Zarqa 13115, Jordan
3. Faculty of Applied Sciences, University Politehnica of Bucharest, 313 Splaiul Independenţei, 060042 Bucharest, Romania
4. Department of Mathematics, The Hashemite University, P.O. Box 330127, Zarqa 13115, Jordan