Damanik, Abdi Rahim, Dedy Hartama, Sumarno Sumarno, and Indra Gunawan. “Sistem Presensi Pegawai Berbasis Digital Signatures Dan Gps Location”. Dike 1, no. 1 (February 28, 2023): 30–36. Accessed September 17, 2025. https://ejournal.cvrobema.com/index.php/dike/article/view/11.