Chi, Tat, and Tran Duc. “Building WebGIS to Provide Information on the Epidemic Circumstances COVID-19”. VNUHCM Journal of Economics, Law and Management 5, no. 4 (August 15, 2021): 1870-1880. Accessed April 27, 2025. https://stdjelm.scienceandtechnology.com.vn./index.php/stdjelm/article/view/780.