1. Department of Mathematics, University of Aden, Aden, Yemen
2. Department of Mathematics, University of Lahej, Lahej, Yemen
3. Department of Mathematics, Al-Azhar University-Gaza, Gaza Strip, Palestine
4. Department of Mathematics and Statistics, Amran University, Amran, Yemen
5. Department of Mathematics, Faculty of Basic Science, Bu-Ali Sina University, Hamedan 65178-38695, Iran
6. Faculty of Exact and Natural Sciences, School of Physical Sciences and Mathematics, Pontifical Catholic University of Ecuador, Av. 12 de octubre 1076 y Roca, Apartado Postal 17-01-2184, Sede Quito, Ecuador
7. Department of Mathematics, College of Science and Humanities in Al-Kharj, Prince Sattam Bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia