N. S. A. ABDULLAH SANI and S. N. . RAHMAT, “Trend Analysis of Rainfall and the Standardised Precipitation Index (SPI) in Johor”, rtcebe, vol. 3, no. 1, pp. 1765–1773, Jul. 2022, Accessed: Apr. 08, 2026. [Online]. Available: https://penerbit.uthm.edu.my/periodicals/index.php/rtcebe/article/view/2980