RUPIASIH, Ni Nyoman. Cover. BULETIN FISIKA, [S.l.], v. 20, n. 2, dec. 2019. ISSN 2580-9733. Available at: <https://ojs.unud.ac.id/index.php/buletinfisika/article/view/55076>. Date accessed: 14 apr. 2026.