Pratiwi, Anita Puji, Trapsilo Prihandono, and Sri Handono Budi Prastowo. “Numerical Solution of Radioactive Core Decay Activity Rate of Actinium Series Using Matrix Algebra Method”. Jurnal Penelitian Pendidikan IPA 7, no. 3 (July 7, 2021): 395–400. Accessed May 4, 2024. https://jppipa.unram.ac.id/index.php/jppipa/article/view/716.