UTAMA, A.; HADI, M. P.; NURJANI, E. Geographic Information Systems Application to Drought Distribution Identification with Standardized Precipitation Index (SPI) Method in Trenggalek Regency. INTENSIF: Jurnal Ilmiah Penelitian dan Penerapan Teknologi Sistem Informasi, v. 5, n. 2, p. 266-278, 8 Aug. 2021.