Arifin M, Suriansyah MI, Chaerunnas A. Penerapan Spherical Law of Cosinus dalam Sistem Presensi BPBD Kabupaten Bogor . jima-ilkom [Internet]. 2025Mar.20 [cited 2026Apr.26];4(1):1-12. Available from: https://e.publication.diskoplampung.com/index.php/jima-ilkom/article/view/35