Manullang, F. P.; Tarigan, K.; Situmorang, M.; Humaidi, S.; Doloksaribu, D. E. D.; Darmawan, Y. Characterization of Meteorological Drought Using Standardized Precipitation Index and Standardized Precipitation Evapotranspiration Index Methods in North Sumatera. J. Prisma. Sains 2023, 11, 1084-1101.