Samanmit, Polpech, Jutithep Vongphet, Ketvara Sittichok, Sasiwimol Khawkomol, and Songsak Bhattrawuhichai. 2023. “Drought Analysis via the Use of Standardized Precipitation Evapotranspiration Index (SPEI): A Case Study of the Eastern Economic Corridor”. Science and Engineering Connect 46 (3). Bangkok, Thailand:239-52. https://ph04.tci-thaijo.org/index.php/SEC/article/view/10171.