Chi Long N, Khanh Luan L. THE SEMIGROUP - CHARACTERIZATION OF A HEAT DIFFUSION PROCESS. VNUHCM Journal of Science and Technology Development [Internet]. 31Aug.1999 [cited 5Sep.2025];2(8):17-4. Available from: https://stdj.scienceandtechnology.com.vn/index.php/stdj/article/view/3666