Nguyen, Tuan, and CảnhTrương. “Research the Drought Characteristics of Ninh Thuan Province through the Rainfall Anomaly Index (RAI), Standardized Precipitation Index (SPI), and the Moisture Index (MI)”. Science & Technology Development Journal: Natural Sciences 6, no. 4 (December 31, 2022): 2415-2430. Accessed July 3, 2024. https://stdjns.scienceandtechnology.com.vn/index.php/stdjns/article/view/1110.