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“Sistem Informasi Presensi Dengan Validasi Radius Lokasi Menggunakan Formula Haversine (Studi Kasus : PT. PICSI)”. Fahma : Jurnal Informatika Komputer, Bisnis dan Manajemen 21, no. 1 (January 31, 2023): 12–23. Accessed July 18, 2025. https://ejournal.stmikelrahma.ac.id/index.php/fahma/article/view/21.