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“Sistem Informasi Presensi Dengan Validasi Radius Lokasi Menggunakan Formula Haversine (Studi Kasus : PT. PICSI)”. 2023. Fahma : Jurnal Informatika Komputer, Bisnis Dan Manajemen 21 (1): 12-23. https://doi.org/10.61805/fahma.v21i1.21.