Pham, Thi Tran Chau, Duc Thinh Vo, Thi Kim Yen Ngo, and Thuy Hoang Yen Tran. 2022. “The Level-Set Method Combined With Desmos Software to Orient the Solution of Inequality Problems”. Dong Thap University Journal of Science 11 (1):3-11. https://doi.org/10.52714/dthu.11.1.2022.919.