R. Azman RMN, M. Noor NA, Abdullah S, Ideris MM. Analysis of Drought Index in Sub-Urban Area Using Standard Precipitation Evapotranspiration Index (SPEI). IJIE [Internet]. 2022 Dec. 15 [cited 2026 Jul. 22];14(9):157-63. Available from: https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/12822