1. Department of Mathematics, Radfan University College, University of Lahej, Lahej 73560, Yemen
2. Faculty of Exact and Natural Sciences, School of Physical Sciences and Mathematics, Pontifical Catholic University of Ecuador, Av. 12 de Octubre 1076 y Roca, Quito 170143, Ecuador
3. Department of Mathematics, College of Science and Humanities in Al-Kharj, Prince Sattam Bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia
4. Department of Mathematics, Faculty of Basic Science, Bu-Ali Sina University, Hamedan 65178-38695, Iran
5. Department of Math and Sciences, Community College of Qatar, Doha 7344, Qatar
6. Institut National Des Sciences Applique’e et de Technologie, Carthage University, Tunis 1054, Tunisia