1. Faculty of Basic Sciences, Van Lang University, 69/68 Dang Thuy Tram Street, Ward 13, Binh Thanh District, Ho Chi Minh City, Vietnam
2. Department of Scientific Fundamentals, Posts and Telecommunications Institute of Technology, Hanoi, Vietnam
3. Department of Mathematics and Physics, University of Information Technology, Ho Chi Minh City, Vietnam
4. Vietnam National University, Ho Chi Minh City, Vietnam