Irda, Sri Viona. “Penurunan Geometri Elipsoida Bumi”. Jurnal Matematika UNAND 4, no. 4 (July 26, 2019): 121–128. Accessed November 3, 2026. https://jmua.fmipa.unand.ac.id/index.php/jmua/article/view/517.