A. Sartimbul, E. Rohadi, M. Firdaus Ali, and Z. Khaidar, “Anomaly technique for expression the Indian Ocean Dipole in South Java Sea”, IJET, vol. 7, no. 4.36, pp. 1258–1260, Dec. 2018, doi: 10.14419/ijet.v7i4.36.28967.