Arief, Syachrul. “Observation of El Niño and La Niña Phenomena, on the Island of Sulawesi - Indonesia, Based on the Global Positioning System (GPS)”. International Journal of Environment, Agriculture and Biotechnology 6, no. 2 (April 19, 2021). Accessed November 22, 2024. https://journal-repository.com/index.php/ijeab/article/view/3467.