Lestari, D. O., E. Sutriyono, S. Sabaruddin, and I. Iskandar. “Respective Influences of Indian Ocean Dipole and El Niño-Southern Oscillation on Indonesian Precipitation”. Journal of Mathematical and Fundamental Sciences, vol. 50, no. 3, Dec. 2018, pp. 257-72, doi:10.5614/j.math.fund.sci.2018.50.3.3.