Chi Long, Nguyen, and Le Khanh Luan. “THE SEMIGROUP - CHARACTERIZATION OF A HEAT DIFFUSION PROCESS”. VNUHCM Journal of Science and Technology Development 2, no. 8 (August 31, 1999): 17-24. Accessed September 5, 2025. https://stdj.scienceandtechnology.com.vn/index.php/stdj/article/view/3666.