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“A Optimization of Direction Finder in Disclosing Cases of Threatening By Jatanras Unit, Criminal Research Unit, Surabaya City Police Office”. Tanggon Kosala 13, no. 1 (April 30, 2024): 20–31. Accessed August 14, 2026. https://journal.akpol.ac.id/index.php/tanggonkosala/article/view/1491.