1. Institute of Research and Development Duy Tan University Da Nang 550000 Vietnam
2. Faculty of Mathematics and Applications Sai Gon University Ho Chi Minh City Vietnam
3. Department of Mathematics and Computer Science University of Science Ho Chi Minh City Vietnam
4. Vietnam National University Ho Chi Minh City Vietnam
5. Faculty of Fundamental Science Industrial University of Ho Chi Minh City Ho Chi Minh City Vietnam
6. Department of Mathematics Cankaya University Ankara Turkey
7. Institute of Space Sciences, Magurele Bucharest Romania
8. Applied Analysis Research Group, Faculty of Mathematics and Statistics Ton Duc Thang University Ho Chi Minh City Vietnam