Cong, Nguyen Dinh
Duc, Luu Hoang
Hong, Phan Thanh
Funding for this research was provided by:
National Foundation for Science and Technology Development (101.03-2019.310)
International Mathematical Union (IMU Breakout Graduate Fellowship Program)
Article History
Received: 19 May 2020
Revised: 30 July 2020
Accepted: 27 August 2020
First Online: 7 September 2020