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