1. Faculty of Mathematics Teacher Education, Tay Ninh University, Ninh Trung, Ninh Son, Tay Ninh Province, Vietnam
2. Department of Mathematics, School of Advanced Sciences, Kalasalingam Academy of Research and Education, Srivilliputhur, 626 126 Tamil Nadu, India
3. Department of Mathematics, School of Advanced Sciences, Vellore Institute of Technology, Vellore 632 014, India
4. Department of Mathematics, College of Natural Sciences, Jimma University, Ethiopia
5. Faculty of Mathematics Teacher Education, Quang Nam Phan Chau Trinh University, Cam Thanh, Cam Ha, Quang Nam Province, Vietnam