Safril, A. (2020) “CHARACTERISTICS OF RAINFALL AND PRECIPITABLE WATER IN THE ANNUAL AND SEMIANNUAL RAINFALL IN THE AREA WITH VARIOUS INTENSITY OF EL NINO (SUMATERA CASE STUDY)”, Spektra: Jurnal Fisika dan Aplikasinya, 5(1), pp. 41 - 52. doi: 10.21009/SPEKTRA.051.05.